i think he's in deep trouble. >> bob shrum, ezra klein, great to have you. >>> rick santorum is using a chunk of north dakota oil to fearmonger. bernie sanders joins us to tell us what is driving up the price. >>> scott walker has done every conservative talk show on the face of the earth, raised millions of outside dollars. the rookie governor is spinning his wheels, new polling out of the badger state. >>> we're buzzing about it.