WASHINGTON (Reuters) - More than two-thirds of Americans disapprove of the way President Barack Obama is handling high gasoline prices, although most do not blame him for them, according to a Reuters/Ipsos online poll released on Tuesday. Sixty-eight percent disapprove and 24 percent approve of how Obama is responding to price increases that have become one of the biggest issues in the 2012 presidential campaign. In the past month, U.S. fuel prices have jumped about $0.30 per gallon to about $3. ...