Add Purell to the list of campaign essentials in Iowa.
A third of likely Democratic caucus-goers said they'd had a conversation with or shaken the hand of one of the Democratic candidates for President according to the latest Washington Post-ABC News Iowa poll.
And the candidate who's had the most face-time? Illinois Senator Barack Obama.
About half of Iowans who report having met a potential Democratic nominee said the candidate they met was Obama, 38 percent said it was former North Carolina senator John Edwards, and 36 percent said they'd greeted Senator Hillary Rodham Clinton.
All told, this means that 17 percent of likely Democratic caucus-goers have met Obama, 13 percent Edwards and 12 percent Clinton.
One in five likely caucus-goers report having met just one candidate, while a lucky 13 percent have met multiple contenders. One percent said they have encountered seven of the eight remaining candidates.
Iowans are famous for rewarding active campaigning in the state with support on caucus night, but how has all the handshaking panned out so far?
Among those Iowans who have come face to face with a Democratic candidate, 32 percent say they support Obama, 23 percent Clinton and 23 percent Edwards.
More information about and full question wording from the Washington Post-ABC News Iowa poll can be found at www.washingtonpost.com/polls.