Former House Speaker Newt Gingrich and former Massachusetts Gov. Mitt Romney spent Monday morning campaigning in Jacksonville. They joined former Pennsylvania Sen. Rick Santorum and former Texas Rep. Ron Paul for a debate Thursday at the University of North Florida. The four are among the names on today’s primary ballot. The Republican National Convention will be Aug. 27-30 in Tampa, where the GOP will choose the party’s nominee to challenge President Barack Obama in the Nov. 6 national election.