U.S. first lady Michelle Obama takes the stage to introduce the President to speak at a campaign rally at the Ohio State University in Columbus

 
U.S. first lady Michelle Obama takes the stage to introduce the President to speak at a campaign rally at the Ohio State University in Columbus
U.S. first lady Michelle Obama takes the stage to introduce the President to speak at a campaign rally at the Ohio State University in Columbus, Ohio in this May 5, 2012 file photograph. In Ohio and other states, where Obama's chances of a second four-year term could hinge on how middle-class families feel about their jobs and finances, Obama has tread lightly in regulating fracking. REUTERS/Kevin Lamarque/Files (UNITED STATES - Tags: POLITICS ELECTIONS ENERGY)