quite the contrary- they're all together on the same page for 99% of their agenda. they all goosestep in unison and sing from the same hymnal songs of worship to Gaia. republicants can't even agree what day it is.
They certainly have been. When they're not worried about losing their seats they follow in lockstep.
However, Dem Senators like Pryor in Arkansas up for re-election are seeing the poll numbers drop from 47% to 31%. These will break from Obama in order to save their seats.
I believe Obamacare is finally going to cause some turmoil in the ranks of these people.