Bill Nelson seems undaunted by prospect of primary challengers

Is Sen. Bill Nelson up for a contested Democratic primary in his re-election bid next year? “You want to do a contest on pull-ups or push-ups?” Nelson replied to a reporter who asked that question during an informal news conference in Tallahassee Monday. News reports have mentioned Tim Canova, who tried and failed to replace Debbie Wasserman Schultz in Congress, former U.S. Senate candidate Pam Keith, and state Sen. Randolph Bracy as primary challengers to Nelson, 74, widely seen as…