Tom Perez being considered for Veep

[Likely Voter]

The OP article doesn't specifically mention it, but Perez' name has been mentioned in the past.
http://www.cnn.com/2016/03/18/politics/tom-perez-vice-president-hillary-clinton-chatter-donald-trump/

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http://latino.foxnews.com/latino/politics/2016/03/14/labor-secretary-tom-perez-mentioned-as-possible-presidential-running-mate/

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https://www.yahoo.com/politics/tom-perez-the-dark-horse-vice-presidential-pick-203317556.html

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[Likely Voter]

speaking Español, here is another article from Politico about the Perez veep buzz. Which included this bit...

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Being a campaign surrogate is often a road test for potential veeps. 

Politico piece also has this bit...

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So he is progressive to satisfy the Bernie Bros, the unions love him which is good for ground game support and money and he is Latino (and actually speaks Spanish). And he is yet another member of the Obama admin, who was asst. AG in charge of civil rights (which should help with the African Americans).  

Downsides are no elected office and not from a swing state (MD) and generally not well known