Nearly a third of Virginia Republicans will vote for Hillary Clinton, pick a third-party candidate or sit out the election if Donald Trump is the GOP’s nominee for president, a new poll finds.

Democrats in the key swing state are far less likely to defect if Clinton is the nominee, with just 9 percent saying they would vote for someone else or stay home on Election Day, according to a Christopher Newport University survey released Thursday.

Trump’s “loyalty gap,” as CNU researchers dubbed it, could cost the celebrity developer the race in Virginia, where the survey finds the former secretary of state leads Trump 44 percent to 35 percent.