In the past few months’ liberal discontent with President Obama has doubled according to the latest CNN-ORG poll (PDF) and this liberal discontent is responsible for almost all of the recent drop in Obama’s job approval numbers.

Throughout 2010 and early 2011 CNN’s polling found that between 6-9 percent of the people who disapproved of President Obama’s job performance did so because he was “not liberal enough.” This polling number jumped to 16 percent in August, effectively twice as high as it ever was before.

On the other hand the numbers of voters who disapprove of Obama’s handling of his job because he is “too liberal” has remained consistent, between 36-40 percent.

From early May to now the “too liberal” number was unchanged at 36 percent. This means that basically the entire seven point drop in Obama’s job approval numbers in the past few months is due to people now thinking he is insufficiently liberal.

This significant drop in support among liberals is likely due, in part, to Obama’s willingness to cave to Republicans demands during the debt ceiling negotiations,  and partly as a result of Obama’s publicly stating he wants to cut Medicare and Social Security.