Agriculture Secretary Tom Vilsack and Sen. Timothy M. Kaine of Virginia have emerged as the leading candidates on a longer list of finalists Hillary Clinton is considering for her vice-presidential running mate, according to interviews with multiple Democrats with knowledge of her deliberations.

Although her list is not limited to those two, Clinton has spoken highly of both in recent days to friends and advisers as she closes in on an announcement that could come as soon as Friday.

President Obama is among those who have advised Clinton on her decision, offering thoughts on the two contenders who serve in his Cabinet, Vilsack and Labor Secretary Thomas Perez, several Democrats said. These individuals did not say what advice the president gave.

These and other Democrats cautioned that Clinton has not made a final choice and is keeping mum about her deliberations. Several other people remain in the running, they said. Clinton campaign press secretary Brian Fallon declined to comment.

Sen. Tim Kaine (D-Va.) is on Democratic presidential candidate Hillary Clinton's short list of potential vice presidential candidates. Here's what you need to know about him. (Sarah Parnass,Osman Malik/The Washington Post)

Clinton is expected to campaign alongside her running mate on Friday or Saturday in Florida, three Democrats familiar with aspects of the plan said. The campaign has announced only that she will make stops in several Florida cities over those two days, in the run-up to her party’s national convention. The convention, where Clinton will formally claim the nomination as the first woman to head the ticket of a major U.S. party, begins Monday in Philadelphia.

The vice-presidential search has been conducted in deep secrecy among a small group of Clinton intimates, even as some aspects were on full and intentional display. Clinton did not conceal her consideration of Sen. Elizabeth Warren (D-Mass.), a liberal firebrand who in turn has not disguised the appeal the job holds for her. Still, Democrats close to both women, including some of Warren’s own advisers, have said Warren was an unlikely choice from the start.

Kaine has been a favorite for the job for months and is the name most often mentioned by Democrats as the front-runner. He and Vilsack share many professional and political attributes, notably their governing experience. Both fit Clinton’s ideal of low-key, loyal effectiveness, people who know both men said. Vilsack carries the additional quality of a long-standing personal friendship with Clinton.

Two Democrats described Perez as a solid third choice, but others cautioned that he may not be in the same category as Vilsack and Kaine. Several Democrats emphasized that the fact that Kaine and Vilsack appear to be the leading contenders does not preclude Clinton’s continuing to weigh her choices from a larger list of contenders.

Perez met with the presumptive nominee at her Washington home late Friday, one Democrat confirmed. All those who spoke did so on the condition of anonymity because the selection process has not been completed.

Perez’s emergence from a crowded back field, these Democrats said, is based largely on a warm relationship with Clinton and his credentials as a liberal with strong relationships with organized labor. He also is Hispanic and has served as a Spanish-speaking surrogate for Clinton.

We narrowed Clinton’s vice presidential possibilities to 27. Now you pick one.

Also in consideration has been retired Adm. James Stavridis, a former four-star commander of U.S. forces in Europe who has strong credentials as a national-security thinker and ties to Clinton from her time as secretary of state.

Julián Castro, the secretary of housing and urban development, has been the Hispanic candidate most frequently mentioned as a potential running mate. His stock may have fallen with a finding by federal investigators Monday that he had violated Hatch Act prohibitions on mixing partisan political activity with official government duties.

Clinton campaign chairman John Podesta is leading the search, which has intensified over the past week to include several face-to-face meetings between Clinton and candidates, including Vilsack, Perez, Warren and Colorado Gov. John Hickenlooper. Meetings were held at Clinton’s Washington home Friday and at other locations.

Vilsack rose through the ranks of local government to become a well-liked governor of Iowa. He was considered as a running mate for then-Sen. John F. Kerry in 2004 and served as head of the centrist Democratic Leadership Conference while in office. In 2008, he was a short-lived presidential candidate.

He is a latecomer to the pool of possible vice-presidential choices, but his star has risen over the past two weeks, several Democrats said.

Vilsack is seen as likely to deliver Iowa, a key swing state. That gives him one potential advantage over Kaine, whose home state of Virginia is also a battleground but one many Democrats judge to be safer for Clinton this year than Iowa.

“He’s not a lot of bling and glitter; he’s just Iowa solid,” said Bonnie Campbell, an Iowa Democratic strategist with longtime ties to both Clinton and Vilsack.

Vilsack also comes with a compelling personal story. He was placed in an orphanage as a young boy in Pittsburgh, then adopted. His adoptive mother was an alcoholic, something he mentions frequently in addresses about the problem of opioid addiction, an issue that falls under the purview of the Department of Agriculture and for which he shares a passion with Clinton.

Vilsack is, however, far from young at 65, and a narrowed field led by Kaine and Vilsack would place two white men atop a list that has included several Hispanic candidates, one white woman and one African American man — a potentially awkward optical reality for Clinton to contend with, particularly within the diverse base of the Democratic party.

Although it is unclear whether Obama offered Clinton thoughts about Kaine, senior White House officials described the one-time mayor of Richmond as particularly in sync with Obama on issues including criminal justice reform, the death penalty and anti-poverty efforts. Kaine was an early Obama supporter back in 2007, and he served as the chairman of the Democratic National Committee after the 2008 election.

“He is this progressive Catholic. He’s like an Obama Catholic,” said one senior administration official, who spoke on the condition of anonymity to comment frankly about the president. “He has thought a lot about these things and can interpret Obama.”

Clinton has acknowledged that the most important criterion is “experience.”

“Would this person be a good president?” Clinton told Charlie Rose of CBS News and PBS on Monday night. “You know, I am afflicted with the responsibility gene, and I know what it’s like being president. I’ve seen it up close, I’ve worked for one, I’ve had that experience.

“So for me there is nothing more important than my rock-solid conviction that the person I choose could literally get up one day and be the president of the United States,” she added.

Prodded by Rose about candidates thought to be in the running, Clinton showered them with praise but declined to say whether they were being considered.

When Rose noted that Kaine considered himself to be “boring,” Clinton laughed and replied: “And I love that about him.”

“He’s never lost an election. He was a world-class mayor, governor and senator and is one of the most highly respected senators I know,” Clinton said.

As for Hickenlooper, Clinton also praised him as “first class.”

Warren?

“Amazing,” Clinton replied. “I mean, what she has done in a relatively few years to put the agenda of inequality front and center is something that I think we should all be grateful for.”

People close to Clinton say that political considerations will come second — if they factor in at all. After the fitness test, the decision is about the deeply personal consideration of the person with whom she would want to be locked in a political contract for at least four years.

John Wagner in Las Vegas, Ed O’Keefe in Cleveland and Greg Jaffe and Juliet Eilperin in Washington contributed to this report.