I agree with you. I still support him. However, I think that he (and Gingrich too, probably) needs to come up with a concise, solid explanation why omnibus bills are unavoidable, and especially in a divided government.
Santorum certainly could have articulated the situation better but in the end he should waste as little time as possible talking about things like omnibus bills.
There are so many important issues out there. The economy, out of control government spending, record deficits, failed energy policy, Obama supplying guns for Mexican drug cartels etc. These are the things the candidates should be talking about.
Santorum shouldn't give bogged down with the intricacies of omnibus budget bills.