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About this Poll

Mason-Dixon Polling and Research, of Jacksonville, Florida, interviewed 625 registered voters by telephone between Oct. 6 and Oct. 8. All said they were likely to vote in the November general election.

The margin of error is plus or minus 4 percent. That means there is a 95 percent probability the exact figure would fall within that range if the entire population were sampled. The margin of error is higher for each subgroup, such as a party or gender group.

Voters interviewed on landlines were selected by a random variation of the last four digits of telephone numbers. Voters interviewed on cellphones were selected from a list of working cellphone numbers. Quotas were assigned to reflect voter turnout by county.