In the final push before Tuesday's key voting, Barack Obama is fighting back against Hillary Rodham Clinton's attack on his foreign policy credentials.
At an Ohio high school in the same town Clinton visited hours earlier, Obama went after a Clinton TV ad which said she'd be the one to handle a national emergency in the middle of the night.
Obama says Clinton got what he called the most important foreign policy decision of this generation wrong -- by voting to authorize the Iraq war.
After an overnight stay at home in Chicago, Obama heads to Texas, the biggest prize in Tuesday's voting. It's a state Obama's aides are saying privately he has a good shot at winning. They're not as certain about Ohio.