Is politics a high-libido profession? Hm... maybe, actually it makes sense. But I think a subculture that holds books like Eros and Civilization from Herbert Marcuse in high regard has probably higher time preferences in it.
Think of all the lower-level political staffers, the volunteers, the politics junkies who came to the convention because they want to hang out with other politics junkies. There are lots of young, enthusiastic people in a city full of strangers who are only going to be there for a week. Like spring break, without the beaches.
But it might be the combination of technological skills and go-getter attitude shared by young political staffers that lead them to post their desires on Craiglist...