The November election between U.S. Sen. Bill Nelson and Rep. Connie Mack in Florida is set to be a close race, according to a new Quinnipiac poll. Sen. Bill Nelson edges Rep. Connie Mack, 43 to 39 percent, in the Sunshine State contest for Nelson’s Senate seat, a new Quinnipiac poll says. “The projected November election between U.S. Sen. Bill Nelson and Mack looks like it could go down to the wire,” said Peter A. Brown, assistant director of the Quinnipiac University Polling Institute. Nelson has gained the slight edge since being tied with Mack in a May 24 poll....