Even if he loses in Iowa's bigger cities, Edwards can still win by wrapping up smaller, far-flung precincts.

From Newsweek:

For months, Edwards has been rounding up support in the state's rural precincts where the front runners have paid less attention. While Obama and Clinton have drawn crowds in the thousands in places like Des Moines and Ames, Edwards has been winning over people in tiny towns like Sac City (population: 2,189). That's important, the strategists say, because under Iowa's arcane caucus rules, a precinct where 25 people show up to vote gets the same number of delegates as a place that packs in 2,500. In other words, even if he loses to Obama and Clinton in the state's bigger cities, he can still win by wrapping up smaller, far-flung precincts that other candidates have ignored. "The bulk of our support is in small and medium counties," says Jennifer O'Malley, Edwards's Iowa state director.