Published: Oct 30, 2012 11:17 PM EDT

FORT MYERS, Fla. - Southwest Florida was at the center of the U.S. Senate race Tuesday, as both Democrat Sen. Bill Nelson and Republican Rep. Connie Mack were in Fort Myers just a few hours apart.

Even with early voting well underway, both candidates say they won't stop campaigning until election day itself.

"I'm in a full-out sprint," Nelson said.

"We're not going to end until Election Day," said Mack.

Challenger Connie Mack stopped in his home county Tuesday to cast his early ballot; while incumbent Bill Nelson visited supporters at the Fort Myers Farmers Market.

"We've been fortunate to pick up all the newspaper endorsements in the state," Nelson said.

"We feel good about where we are and where we think we'll be on Election Day," Mack said.

The contentious senate race has seen both candidates and their supporters leveling accusations against the other, with millions of dollars spent on political advertising by the candidates and PACs.

"The information that we've put up, so people know who our opponent is, the fact checkers have looked at that, and they say its true," Nelson said.

"Bill Nelson has spent almost all of his 16 million dollar on attacking me, and hasn't put one idea for how to help the people of the state of Florida or this country," said Mack.

A sampling of polls over the last week show Nelson leading Mack by as much as 8% in polls by Survery USA and Public Policy Polling; but Mack trails by just three percent in a recent Rasmussen Reports poll.

The numbers give Nelson confidence.

"I am somebody that can reach across the partisan divide and bring people together," Nelson said.

But Mack's campaign is predicting a win for him.

"Internally, we've looked at the numbers, I think we're going to win this race 49.1 to 47.7," Mack said.