NBC News took a look at the field of possible vice presidential candidates -- with all their strengths and weaknesses -- for presumptive Democratic nominee Hillary Clinton.
The field includes Labor Secretary Tom Perez who is a career advocate for organized labor, minorities and immigrants.
And Sen. Elizabeth Warren, who isn't a go-along, get-along person, which is a big requirement of the VP job. If she did become VP, Warren's vacancy would trigger a special election in Massachusetts.
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Other possible contenders: Ohio Sen. Sherrod Brown, Housing and Urban Development Secretary Julian Castro, Virginia Sen. Tim Kaine, and Minnesota Sen. Amy Klobuchar.