Ohio State University

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President Barack Obama waves to supporters at Rickenbacker International Airport in Columbus, Ohio, as he arrives for a campaign stop at The Ohio State University Tuesday, Oct. 9, 2012. (AP Photo/Paul Vernon)

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President Barack Obama speaks at a campaign event at The Ohio State University Oval, Tuesday, Oct. 9, 2012, in Columbus, Ohio. (AP Photo/Carolyn Kaster)

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President Barack Obama pauses as he speaks at a campaign event at The Ohio State University Oval, Tuesday, Oct. 9, 2012, in Columbus, Ohio. (AP Photo/Carolyn Kaster)

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**FILE** President Obama arrives Oct. 9, 2012, to speak at The Ohio State University Oval in Columbus, Ohio. (Associated Press)

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President Barack Obama speaks during a campaign event at the Ohio State University Oval on Tuesday, Oct. 9, 2012, in Columbus, Ohio. (AP Photo/Tony Dejak)

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President Obama greets people at the Ohio State University Student Union on Tuesday, Aug. 21, 2012, in Columbus, Ohio. (AP Photo/Carolyn Kaster)

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President Barack Obama speaks during a campaign rally at Ohio State University in Columbus, Ohio, Saturday, May 5, 2012. (AP Photo/Mark Duncan)

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In a March 8, 2011 file photo, Ohio State football coach Jim Tressel, left, sits next to E. Gordon Gee, Ohio State University president, during a news conference, in Columbus, Ohio. Ohio State announced Monday, May 30, 2011 that football coach Jim Tressel has resigned as the NCAA investigates the Buckeyes for possible rules violations. The school says Luke Fickell, an assistant head coach under Tressel, will serve as interim head coach for the 2011-2012 season. (AP Photo/Terry Gilliam, File)

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This undated image provided by Ohio State University shows Ellesmere Island National Park in Canada. Ohio State University researchers and their colleagues have discovered the remains of a mummified forest that lived on the island 2 to 8 million years ago, when the Arctic was cooling. This mummified forest is giving researchers a peek into how plants reacted to ancient climate change. That knowledge will be key as scientists begin to tease out the impacts of global warming in the Arctic.(AP Photo/Ohio State University, Joel Barker)

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This undated image provided by Ohio State University shows Ellesmere Island National Park in Canada. Ohio State University researchers and their colleagues have discovered the remains of a mummified forest that lived on the island 2 to 8 million years ago, when the Arctic was cooling. This mummified forest is giving researchers a peek into how plants reacted to ancient climate change. That knowledge will be key as scientists begin to tease out the impacts of global warming in the Arctic. (AP Photo/Ohio State University, Joel Barker)

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Ohio State students walk past the main library while it is closed because of a bomb threat at Ohio State University Tuesday, Nov. 16, 2010, in Columbus, Ohio. (AP Photo/Jay LaPrete)