Obama prepares for second debate as Romney and Ryan campaign in Ohio

President spends Saturday on debate preparation while Republican rival hits campaign trail in battleground state President Barack Obama hunkered down for intensive debate preparation in Virginia on Saturday, as his Republican rival, Mitt Romney, continued his push to win votes in battleground states. Romney and his running-mate, Paul Ryan, hit the campaign trail in Ohio, a crucial barometer of voting intention and a must win for both candidates in the 6 November general election. Buoyed by a str...