Predict the two tickets

[Mister Mets]

The likeliest match-up is Clinton/ Castro VS Paul/ Walker

Given the potential Clinton running mates, and the number of potential Republican presidential nominees, to say nothing of the plausible running mates, there may not be a ten percent chance we'll see this particular match-up.

I think Democrats tried to build a running mate for Clinton by giving Castro a cabinet post, given the paucity of Hispanic statewide officeholders. A younger western Hispanic guy is probably the best match for her. He also backed her in 2008, and is a protege of one of a former Bill Clinton cabinet secretary, which is a big deal because the Clintons are horrible, petty and insular people.

Rand Paul is one of the Republican frontrunners, and he seems to have the most obvious running mate. Scott Walker adds executive experience and geographic diversity, without undercutting Paul's likely message. His profile is also likely to be increased with a presidential bid.

[Mister Mets]

The likeliest match-up is Clinton/ Castro VS Paul/ Walker

What makes Paul more likely to win the nomination than any other Republican? And for VPs, we're all pretty much shooting in the dark anyway. We really have no idea what factors the specific person will be looking for. And someone who looks good on paper could still fail the vetting process or decline the offer.

I don't think Paul's more likely to win than any other Republican. Jeb and Christie are probably likelier to win, but I think Walker's a more obvious fit for Paul than any specific individual is for Jeb or Christie.