Tango Ranks 2008's Political Couples

The whole is greater than the sum of its parts... but in a relationship, it's the parts that make a couple tick. That's why we compared the campaigning couples across different criteria on a scale of one to five. Here's a sneak peek at which union is best suited to a White House Stay.

The Criteria:

Charisma: Are the compelling to the public?

Stability: How solid is their relationship?

Chemistry: Do they have a palpable romantic spark?

Visibility: Can they keep their political and personal scandals out of the headlines?

Synergy: Is the candidate's spouse a campaign asset or a liability?