Republican Senators in Florida, Ohio and Pennsylvania are beating their democrat opponents according to a Quinnipiac poll.
In Florida Senator Marco Rubio is beating Congressman Pat Murphy 50 to 37. He is also beating another possible opponent, Congressman Alan Grayson 50 to 38. In Ohio Senator Rob Portman is beating former Governor Ted Strickland 47 to 40. In Pennsylvania Senator Pat Toomey is over Democrat Katie McGinty 49 to 39.
Much more information from Quinnipiac here.