I just built a spreadsheet with that data merged with the 2013 estimated state populations and came up with an estimate of the ratings for the US population as a whole.
US population: 316128839
Those that approve of Obama's performance: 128416502 (40.6%)
Those that disapprove of Obama's performance: 178557823 (56.4%)
If you just average the percentages without taking state populations into consideration the results are 38.1% vs 59.1%.
There are no dangerous weapons; there are only dangerous men. - RAH
Four boxes to be used in defense of liberty: soap, ballot, jury, ammo - use in that order.
If you aren't part of the solution, then you obviously weren't properly dissolved.