FILE - In this Oct. 9, 2012 file photo, President Barack Obama arrives to speak at The Ohio State University Oval, in Columbus, Ohio. Winning Ohio is complicated, with its variety of vo

 

              FILE - In this Oct. 9, 2012 file photo, President Barack Obama arrives to speak at The Ohio State University Oval, in Columbus, Ohio. Winning Ohio is complicated, with its variety of vo
FILE - In this Oct. 9, 2012 file photo, President Barack Obama arrives to speak at The Ohio State University Oval, in Columbus, Ohio. Winning Ohio is complicated, with its variety of voter groups and swinging trends. Diverse in geography, economy and demographics, Ohio is a state that one political scientist says offers a fairly close mirror of the nation. History and electoral math say the swing state is pivotal again this year, and probably crucial for Mitt Romney to win. President Barack Obama is trying to repeat his 2008 victory. (AP Photo/Carolyn Kaster, File)