The poll was conducted using an online panel of 1,772 likely voters on Saturday and Sunday, beginning one day after Comey's announcement. The poll carries a margin or error of 2 percentage points.
In a separate poll conducted before Comey's disclosure, Clinton was leading by three points in the four-way race, and five points in the two-way race. Put simply, there is not yet evidence that the revelations have drastically altered the contours of the election.
Thirty-nine percent of voters said the additional review of emails in the Clinton case had no bearing on their vote in November, while 33 percent it made them much less likely to vote for Clinton.
But most of those voters are already aligned against Clinton. Nearly two-thirds of Trump voters, 66 percent, said it makes them much less likely to vote against Clinton.
Among the small pocket of undecided voters remaining, 42 percent said it made them less likely to vote for Clinton, including 30 percent who said it made them much less likely to vote for her. But just as many, 41 percent, said it makes no difference either way.