Brady Carlson

Presidential campaigns are spending tens of millions of dollars ahead of the New Hampshire primary. That's a windfall for the state's only network TV affiliate, where much of the money is being spent.

House party, that is. Even as campaigns get larger, candidates who want to win in New Hampshire continue to meet voters one-on-one. Why does this curious tradition survive?

Associated Press photographer Jim Cole has covered every New Hampshire presidential primary since 1980. Now he's preparing for the 2016 primary.