FILE - In this Sept. 17, 2012 file photo, President Barack Obama speaks at a campaign event in Columbus, Ohio. Both presidential campaigns are trying to take advantage of an unusual Iow

 

              FILE - In this Sept. 17, 2012 file photo, President Barack Obama speaks at a campaign event in Columbus, Ohio. Both presidential campaigns are trying to take advantage of an unusual Iow
FILE - In this Sept. 17, 2012 file photo, President Barack Obama speaks at a campaign event in Columbus, Ohio. Both presidential campaigns are trying to take advantage of an unusual Iowa law that gives their supporters a major say in determining where ballots can be cast before the election. Iowa’s law allows anyone who gets the signatures of 100 county voters to choose a specific voting place in that county. Before early voting begins Thursday, volunteers for both campaigns turned in a batch of petitions last week calling for voting at locations most convenient to their voters. (AP Photo/Carolyn Kaster, File)