Powerline gathers the evidence that the "77 cents" line makes no sense.
In truth, the 77 cents canard represents the Democrats’ contempt for the low information voters who make up such an important part of the Democrats’ coalition. The canard seeks to exploit their ignorance. It should be an embarrassment, to borrow Obama’s judgment on the alleged disparity. Indeed, it’s something worse than embarrassing. It’s wrong to exploit the ignorance of the ignorant for petty political purposes.