Campaigning is pretty much the ultimate in speed-dating, with introductions to hundreds of supporters -- already predisposed to be in awe -- at every stop. It also gets a guy very close to female staffers, pundits and the occasional lobbyist.

"Power is an aphrodisiac to women," says "When Good People Have Affairs" author Mira Kirshenbaum. "Plus there's the possibility she could become half of a power couple. What woman wouldn't want that?"