The poll by SurveyUSA finds that matched up directly, Trump garners 45 percent to Clinton's 40 percent.

In other head-to-head matchups, Trump beats out Sen. Bernie Sanders (I-Vt.) by 44 percent to 40 percent; Vice President Joe Biden by 44 percent to 42 percent; and former Vice President Al Gore by 44 percent to 41 percent.

Trump's surge past Clinton marks a dramatic turnaround in the polls.

A CNN/ORC sampling of national voters in late June — just days after Trump entered the race — found that 59 percent supported Clinton to 34 percent picking Trump in a head-to-head race.