Romney’s top-five vice presidential nods: Who’s the potential time bomb? (Originally posted on Yahoo!'s "The Signal" Blog)

Now that the race for the Republican nomination is effectively over, Mitt Romney's campaign is speaking publicly about who they might choose as his running mate. While the prediction markets we rely on for forecasting elections also take action on vice-presidential nominees, this is a different type of race, decided by a small council of insiders rather than an election or caucuses. The current frontrunner in the prediction market data is Marco Rubio, the first term senator from Florida.

A presidential candidate has two political priorities for his second-in-command: That the candidate helps and that the candidate does not hurt. For Romney, this breaks down as follows: A candidate can help by providing the former Massachusetts governor cover from the right, recruiting some votes from the center or left, or by helping capture the candidate's home state or region. A candidate can hurt Romney by overshadowing the campaign, either with questions about his or her fitness for the top office–see Quayle and Palin–or by causing a scandal of some degree. Reaching a bit farther back, one can recall Thomas Eagleton of Missouri throwing the 1972 McGovern ticket into total chaos when it was revealed he was treated with shock therapy for depression and possibly an alcoholic.

Let's look at who leads in the market and their individual potential for helping or harming Romney's chances …

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