A new Mason-Dixon poll in Florida shows Marco Rubio (R) leading Gov. Charlie Crist (I) in the U.S. Senate race by 15 points, 42% to 27%, followed by Rep. Kendrick Meek (D) at 21% and 10% still undecided. Said pollster Brad Coker: "Rubio is in the catbird's seat. Most Crist voters don't seem likely to jump to Meek and most Meek voters don't appear ready to throw in with Crist.