9 Percent Of Early Voters, Don't Know Who They Voted For.

From that LAT poll of Florida of Ohio (here is the PDF with all the numbers):

Already Voted:

Florida: McCain 49%, Obama 45%, Don't Know 6%

Ohio: Obama 57%, McCain 35%, Don't Know 3%

That's right: Almost 9% of Florida and Ohio voters that have already voted don't know who they voted for.