A new national poll (well, two days old) from IBD/TIPP (Fivethirtyeight pollster rating: B) shows pretty major shakeups in the nominating races for both parties.
The topline numbers:
Republicans: Carson 24 Trump 17 Rubio 11 Fiorina 9 Bush 8 Cruz 6 Kasich 4 Ryan (?) 3 Huckabee 2 Christie 2
Dems: Clinton 42 Biden 22 Sanders 18