Exit polling is often quite accurate, so much so that news organizations will often project a winner based on 5%-10% of the vote coupled with what voters are saying when leaving the polling stations.
If you were watching it live, you would have noticed that this particular graphic was pulled off the screen as fast it was put up. Quite curious that, considering the overwhelming nature of the results presented in the graphic, it wasn't mentioned again.
Considering that the media is owned by the proverbial establishment and Ron Paul is not favored by the status quo, it's actually not surprising at all that the media (or their corporate masters to be more precise) don't want this type of information being given to and digested by the American people.
I bet whoever put this graphic up got fired the next day.
Of course, this is all just my opinion.