In current weeks, Vice President Kamala Harris has dashed off to Florida on brief discover. She sparred with the state’s conservative governor, Ron DeSantis, over the best way to train slavery in colleges. And she flew into Iowa to defend abortion rights whereas 13 Republican presidential candidates had been having dinner a number of miles away.

Although her phrases had been directed at Republicans, her message was additionally geared toward all her doubters.

Once a rising star as a senator in California, Ms. Harris has for years been saddled by criticism of her efficiency as vice chairman. She has struggled with difficult assignments on points such because the roots of unlawful migration and the slim path to enduring voting rights protections. Concerns about her future unfold as Democrats contemplated whether or not she could be a political legal responsibility for the ticket.

Ms. Harris’s current strikes are her newest try to silence these considerations and reclaim the momentum that propelled her to Joseph R. Biden Jr.’s aspect as a candidate and into the White House in 2020.

“It’s good to have her out there,” stated Cedric Richmond, a senior adviser for the Democratic National Committee, who added that the vice chairman’s resolution to tackle the Republican Party — assertively and in actual time — was central to the marketing campaign’s 2024 technique.

It additionally retains President Biden above the fray.

“He is still uniting the West against Russian aggression, and he’s tackling the economy and inflation,” Mr. Richmond stated. “She can go highlight the accomplishments, and she can take on people like DeSantis.”

In interviews, aides and advisers acknowledge that Ms. Harris has been affected by the years of criticism. She has typically approached occasions defensively, specializing in not making errors, somewhat than searching for alternatives to assault.

But now, galvanized by what she has described as rising extremism within the Republican Party, Ms. Harris is increasing her profile.

The tussle with Mr. DeSantis, who’s struggling to break through as he campaigns to be the Republican presidential nominee, gives a glimpse into Ms. Harris’s function as one thing of a one-woman rapid-response operation.

When Florida final month accepted an overhaul to its standards for instructing Black historical past, which now say center schoolers must be taught that enslaved individuals developed abilities that could possibly be of private profit, Ms. Harris directed her employees to get her down instantly to Jacksonville, a White House official stated.

She was on the bottom inside 24 hours, chatting with a packed viewers in a traditionally Black neighborhood, about “extremist so-called leaders” who wish to sanitize historical past.

“How is it that anyone could suggest that in the midst of these atrocities that there was any benefit to being subjected to this level of dehumanization?” Ms. Harris stated, drawing a standing ovation from the group.

Her look caught the attention of Mr. DeSantis.

“You clearly have no trouble ducking down to Florida on short notice,” he stated in an open letter final week, accusing her of attempting to attain political factors and alluring her to debate the brand new requirements.

Ms. Harris, who returned to Florida for her second journey in lower than two weeks, had a swift reply.

“Well, I’m here in Florida,” she stated earlier than pausing as the group at an African Methodist Episcopal Church occasion in Orlando erupted in applause. “And I will tell you, there is no round table, no lecture, no invitation we will accept to debate an undeniable fact: There were no redeeming qualities of slavery.”

The vice chairman’s press secretary, Kirsten Allen, stated Ms. Harris would “continue to call out extremist leaders as they attempt to pull our country backward with book bans, revisionist history and barriers that make it harder for Americans to participate in our democracy.”

Despite her extra public function, Ms. Harris’s approval rankings have remained stubbornly low. About 52 % of Americans have a detrimental view of her, whereas 40 % have a constructive view, according to FiveThirtyEight’s ballot tracker. Mr. Biden has additionally had trouble with persistently low approval ratings.

But Ms. Harris connects to sections of the voters that aren’t at all times a pure match for Mr. Biden, together with ladies, minority teams and youthful voters. At 58, Ms. Harris is a long time youthful than the 80-year-old president, who could be 86 on the finish of a second time period.

As Ms. Harris followers out throughout the nation, a few of her longtime allies stated she was exhibiting the sort of swagger they remembered from a lot earlier in her profession, courting again to her days as district legal professional of San Francisco and legal professional common of California.

“Seeing her in this role, understanding she has a president who she reports to, it’s kind of funny to me,” stated Lateefah Simon, who was employed by Ms. Harris in 2005 to steer a brand new program geared toward holding first-time drug offenders out of jail.

She recalled a assured Ms. Harris strolling by the workplace when she received re-election for district legal professional in 2007, reminding every staffer that she could be the boss for one more 4 years. Ms. Simon believes Ms. Harris is making an impression as vice chairman however wonders how she is adjusting to being second in command.

“I’m like, ‘Kamala with a boss?’” she stated.

Ms. Harris typically attracts on her authorized background on the marketing campaign path as a option to emphasize her experience — a technique that serves as a counterweight to Republican claims that she is incompetent.

At a current speech on gun reform, she stated she had studied post-mortem images and had “seen with my own eyes what a bullet does to the human body.”

And in July, when she made a visit to Iowa for a dialogue on reproductive rights, she stated that she had investigated intercourse crimes, so she understood that denying a lady an abortion was an “immoral” strategy to survivors of rape or incest.

The timing of the journey to Iowa was no accident: As she spoke at Drake University, saying opponents of abortion in state legislatures across the nation “don’t even know how women’s bodies work,” former President Donald J. Trump and a dozen of his rivals for the Republican presidential nomination had been in Des Moines for a G.O.P. dinner.

Her look got here simply two weeks after the state’s Republican governor signed a strict new abortion ban into regulation, making it unlawful to have the process previous six weeks of being pregnant. (A decide has put the ban on maintain.)

Ms. Harris’s resolution to go on the offensive is a notable shift.

For all of her boundary-breaking as the primary girl, the primary African American and the primary Asian American to function vice chairman, she has lengthy been identified for pragmatism and, to her critics, for a protection of the established order.

She has described herself up to now as a “pragmatic prosecutor” who owns a gun for private security and likewise believes in legal justice reform. As vice chairman, she has needed to enchantment to broad constituencies; being seen as a reasonable is a profit at a time when conservative critics have tried to painting her as radical and out of step with the nation.

But now, with the marketing campaign in full swing, the White House is giving Ms. Harris room to make extra assertive strikes towards Republican opponents.

She additionally has been freed as much as journey extra, one thing that has been within the works because the midterm elections when Democrats held off a widely expected red wave.

Because the Senate was cut up evenly for the primary two years of the Biden administration, Ms. Harris may by no means be greater than 24 hours away from the Capitol when the Senate was in session in case her tiebreaking vote was wanted.

With Democrats now holding a 51-to-49 edge, not less than in circumstances when Senator Kyrsten Sinema, the Arizona unbiased, votes with them, Ms. Harris has extra flexibility to maneuver. Some are hoping she continues to grab on the chance.

Stefanie Brown James, a co-founder of the Collective PAC, a corporation that helps elect Black officers, has urged Ms. Harris’s employees to have her out in entrance on affirmative motion and abortion points, specifically. She stated for the previous two and a half years, Ms. Harris was “a little too much in the background and not seen enough or heard enough.”

“She definitely is having a moment,” Ms. James stated. But she added a observe of warning, saying she hoped it will be “a sustainable moment.”