Among those likely voters, 41% described themselves as Democrats, 29% described themselves as Independents, and 30% described themselves as Republicans
The poll is garbage.
A case could be made that this poll says a lot. A D+11 sample was needed to get the race to 49-49, while Romney leads INDs by 22 (59-37). Even if this were D+6 and Romney led INDs by 11 (half), it would still spell trouble for Obama.