Romney, who made countless stops here prior to the New Hampshire Primary, now has a lot of ground to make up after spending the last three months campaigning elsewhere.
The Obama campaign has been busy during that time ramping up with staffers, and Biden has spent a ton of time here in recent months.
"They started early," said Andy Smith, director of the University of New Hampshire Survey Center. "This is Biden's fifth or sixth visit, Obama's been up here, his wife's been up here. This is an indication they think this state's going to be very close. And the fact that only four electoral votes are at stake here means they think the entire race is going to be close."