A new Republican poll indicates Rep. Tim Mahoney (D-Fla.) is the most endangered incumbent in the country days after a news report showed he paid a former mistress hush money. The poll, released Friday and conducted for Republican Tom Rooney’s campaign and the National Republican Congressional Committee (NRCC), shows a big shift in the race, which Mahoney had been leading. He is now behind Rooney, 55 percent to 29 percent, with 16 percent of voters undecided.