If you look at internals they have Obama getting 11% of Repubs. And Romney only getting 5% of Dems.
However, in the last 3 presidential elections (even in 2008) the Dem never pulled more from GOP base. It was always GOP winning over Dems. (according to Jay Cost)
Yet after 4 years of Obamanomics we are to believe Obama will beat Romney 2-1 in pulling from base?
IMO, that is the skew.
If base vote were same (90-10), which most every national poll shows, Romney would be tied.
For ppp to get Obama such strong base support (not matched in other Ohio polls) they had to poll a lot in Cleveland and Columbus.