The Washington Post answers the question (emphasis added):

Take Pennsylvania, Colorado, Ohio and Indiana – four states that Obama won by 10, nine, five and one percentage points, respectively, in 2008.
In each of those states, his job-approval numbers have taken a hit. A Franklin & Marshall poll released in Pennsylvania last week showed that just more than one in three (37 percent) rate the job the president has done as ‘excellent’ or ‘good.’ Internal Democratic polls released over the past week put Obama’s job-approval score at 42 percent (in Colorado) and 38 percent (in Indiana). In Ohio, a recent Quinnipiac University poll showed that 45 percent approved of the job he was doing, while 49 percent disapproved.