TALLAHASSEE, Fla. (AP) - A new poll shows U.S. Rep. Connie Mack IV as a heavy early favorite with registered Republican voters who will choose a nominee for the U.S. Senate in August.
 
Mack was the only Republican to receive double-digit support in a random telephone survey of 560 Republican voters taken between Jan. 4-8 by Quinnipiac University. The poll has a margin of error of plus or minus 4.1 percentage points.
 
The son of former U.S. Sen. Connie Mack III, Congressman Mack was favored by 39 percent of the poll's respondents. Former U.S. Sen. George LeMieux and Tea Party favorite Mike McCalister each received 6 percent while 42 percent said they were undecided.
 
Mack and incumbent U.S. Sen. Bill Nelson were virtually deadlocked in a potential general election matchup.