Seniors are an important voting bloc, particularly in primaries, because they reliably show up at the polls.
The Republicans who beat out Paul were Sen. Ted Cruz of Texas at 4 percent, Ben Carson at 6 percent, and Wisconsin Gov. Scott Walker and former Florida Gov. Jeb Bush at 10 percent each.
Among Republican voters, 5 percent said Paul was their candidate of choice, putting him ahead of Rubio at 4 percent and Hillary Clinton at 2 percent. The frontrunner among GOP candidates was Walker, with 20 percent of Republican voters picking him. Bush was a close second with 19 percent.