Washington (CNN)Donald Trump and Ben Carson are settling into their respective first- and second-place spots at the top of the GOP field of presidential candidates while Hillary Clinton continues to nearly double her closest rival Sen. Bernie Sanders in the Democratic primary, according to a new national poll. While Trump is maintaining his lead over the 15 other candidates for the GOP nomination with 26% of the support, Carson made his strongest showing yet in the Farleigh Dickinson University poll released Thursday with 22%.