[cnn-photo-caption image= http://i.l.cnn.net/cnn/2008/POLITICS/01/29/fl.primary/art.GOP.ap.jpg caption=" The GOP candidates are in for a key test in Florida."](CNN) - Republicans have battled fiercely for votes in Tuesday's critical Florida primary, as Democrats have largely ignored the state after national leadership said it would not seat Florida's delegates because of a squabble over scheduling.
Sen. John McCain of Arizona and former Gov. Mitt Romney of Massachusetts appear to be neck-and-neck in the Republican primary. If McCain wins in Florida, his status as the national front-runner will be cemented.
If Romney comes out on top, the battle for the GOP presidential nomination will be up in the air.
Related: Watch Mary Snow's analysis of the GOP showdown