A CBS News poll surveying Florida voters found that almost a quarter of Hillary Clinton supporters would possibly consider voting for Donald Trump to “shake up the political system.”

Pollsters, who released the results Sunday, asked Clinton supporters who had not already voted: “Even though you aren’t voting for him now, would any of these be reasons to consider voting for Donald Trump?” Of those who said they planned to vote for Clinton, 24 percent said “shaking up” political leadership in Washington, D.C. would be a reason to vote for Trump.

Another seven percent said that “ending political correctness” is another reason to vote for Trump.

Yet most voters appear dead-set in their choice for president. Of those who have chosen their candidate, 79 percent said their minds are made up. Fifteen percent said their vote is strong, and they “probably” won’t change their vote. Six percent said they “might” or will “probably” change their vote.

When asked how likely they are to vote, 25 percent said they had already voted early or by mail. Another 73 percent said they will “definitely” vote in the upcoming days. Sixty-five percent they “can’t wait” to vote.

Of those who already voted, 98 percent voted by mail. Republicans hold only a tiny lead over Democrats in mail-in votes so far, according to reports.

“In Florida, Republicans typically outperform Democrats in mail-in votes, but this year Democrats may be narrowing that gap and earlier this week were even ahead in the number of mailed ballots cast by voters registered with their party,” ABC News reports. “Registered Republicans had by Friday taken the lead on mail-in votes in Florida but only by about 5,800 votes, a number that pleases the state’s Democratic Party.”

Florida is a critical swing state with 29 electoral votes. Polls show a toss-up between Clinton and Trump, with the CBS poll finding the two were locked in a statistical tie.

CBS questioned 1,042 likely Florida voters from Oct. 20 to Oct. 21.