Hillary ClintonHillary Diane Rodham ClintonBudowsky: Closing message for Democrats Election Countdown: Dems outraise GOP in final stretch | 2018 midterms already most expensive in history | What to watch in second Cruz-O'Rourke debate | Trump raises 0M for reelection | Why Dems fear Avenatti's approach GOP mocks Clinton after minor vehicle collision outside Mendendez campaign event MORE is nearing the end of a long Democratic primary that will almost certainly leave her as the party’s presidential nominee.

It has also revealed weaknesses that Clinton will need to fix in order to defeat presumptive GOP nominee Donald TrumpDonald John TrumpFive takeaways from Cruz, O'Rourke's debate showdown Arpaio files libel suit against New York Times IMF's Christine Lagarde delays trip to Middle East MORE in the fall.

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Picking the right vice presidential candidate will be a key decision for Clinton as she looks to strengthen her campaign for the fall.

Here are the candidates getting the most buzz in Clintonworld.

Sen. Tim KaineTimothy (Tim) Michael KaineOvernight Defense: Trump says 'rogue killers' could be behind missing journalist | Sends Pompeo to meet Saudi king | Saudis may claim Khashoggi killed by accident | Ex-VA chief talks White House 'chaos' | Most F-35s cleared for flight Democrats torch Trump for floating 'rogue killers' to blame for missing journalist Election Countdown: O'Rourke brings in massive M haul | Deal on judges lets senators return to the trail | Hurricane puts Florida candidates in the spotlight | Adelson spending big to save GOP in midterms MORE (Va.)  

The former governor turned senator has become a favorite among Clinton insiders.

They see the centrist as a rising star in the Democratic Party would could help Clinton carry Virginia, a must-win state for Republicans.

Team Clinton likes that Kaine has good ties with the business community, has foreign policy chops and is well-versed in the party apparatus — he is as former chairman of the Democratic National Committee.

Kaine, who was also very high on President Obama’s short-list in 2008, is also well-liked among his peers in the Senate.

“Tim Kaine is the best choice in my mind out of all [the potential candidates for VP.],” said one Democratic strategist. “He has the best quality of being a VP: loyal soldier, no delusion of being POTUS, all the donors love him. Fluent in Spanish, and just a great guy.” 

Clinton’s biggest weakness in the primaries has been with white men, a constituency where Kaine could help her.

He wouldn’t be the most exciting choice, and has views that are similar to Clinton’s — which could be seen as a drawback in some quarters.

Others say that’s not a problem.

“They seem to reflect each other, which is fine,” said Jim Manley, a Democratic strategist and former aide to Senate Majority Leader Harry ReidHarry Mason ReidMajor overhauls needed to ensure a violent revolution remains fictional Senate heads home to campaign after deal on Trump nominees GOP has always been aggressive in trying to weaponize the system of judicial nominations MORE (D-Nev.).

Sen. Sherrod BrownSherrod Campbell BrownOn The Money: Deficit hits six-year high of 9 billion | Yellen says Trump attacks threaten Fed | Affordable housing set for spotlight in 2020 race Lawmakers, Wall Street shrug off Trump's escalating Fed attacks The Hill's Morning Report — Presented by PhRMA — Dem victories in `18 will not calm party turbulence MORE (Ohio)

Brown is another name getting a lot of buzz.

He’s a favorite in media circles on the left. No less than MSNBC star Rachel Maddow has hailed Brown as a smart VP pick who would help Clinton connect to white, working-class men.

Brown could obviously be helpful in swing-state Ohio, and Clintonites think Brown’s brand of authentic progressivism could be a hit in other Rust Belt states such as Michigan—where Clinton surprisingly lost the Democratic primary to Bernie SandersBernard (Bernie) SandersFive takeaways from Cruz, O'Rourke's debate showdown Live coverage: Cruz faces O'Rourke in Texas debate showdown Saudi mystery drives wedge between Trump, GOP MORE.

A progressive who has been a longtime critic of globalization, he might also bring over some Sanders supporters who are considering staying home on Election Day.

“He would be an attractive counter-balance,” Manley said.

Brown has repeatedly said he is not interested, however, and some people believe him.

Another negative? Ohio Gov. John Kasich would get to choose his replacement, endangering a Democratic Senate majority.

Sen. Elizabeth WarrenElizabeth Ann WarrenPavlich: The left’s identity politics fall apart Graham: It would be 'like, terrible' if a DNA test found I was Iranian Iranian-American group calls on Graham to apologize for 'disgusting' DNA remark MORE (Mass.) 

No pick — aside perhaps from Sanders himself — would excite the Feel the Bern crown more than Warren.

Team Clinton is more intrigued than ever about a Clinton-Warren ticket, and some strategists say the longer Sanders stays in the race, the more likely Clinton could pick Warren to be her running mate.

Warren remains the only Democratic woman in the Senate who has not endorsed Clinton, an irksome fact to some in Clinton’s orbit.

But Warren’s Twitter war with Trump over the last week has raised her vice presidential stock tremendoustly.

 “@realDonaldTrump: Your policies are dangerous, your words are reckless. Your record is embarrassing. And your free ride is over,” Warren wrote in one recent Tweet.

 “She has turned out to be an amazing surrogate,” said one longtime Clinton ally. “And she knows what she’s doing.”

Labor Secretary Thomas E. PerezThomas Edward PerezClinton’s top five vice presidential picks Government social programs: Triumph of hope over evidence Labor’s 'wasteful spending and mismanagement” at Workers’ Comp MORE

Perez is very well-liked in the White House and maintains a close relationship with Obama chief of staff Denis McDonoughDenis Richard McDonoughLive coverage: Justice IG testifies before House on report criticizing FBI Ex-Obama chief of staff: Obama's Russia response was 'watered down' Former Obama officials launch advocacy group aimed at Trump's foreign policy MORE.

Many see him as having all the right attributes to fill the ticket and win over progressives.

Unions love him, plus he speaks fluent Spanish could help further drive Latinos to Clinton's column. 

Perez told reporters this week that he has had “no conversations” about a possible VP role.

Instead, he said, he is focused on his job and “in my spare time” is also helping to elect Clinton. 

Gov. John Hickenlooper (Co.) 

Some in Clintonworld say the Colorado governor's name should be on any short list.

For starters, a win in Colorado would cement the race for Clinton.

Hickenlooper has also been a loyal soldier to Clinton during the primary, particularly when his state voted for Sanders by nearly 20 percentage points.

Clinton and Hickenlooper spent time together in April when she attended a fundraiser at his home.

Insiders say if he doesn't get a nod for VP, Clinton will likely consider him for a cabinet position, should she be elected.