On the contrary there are wide differences among conservatives a fact rooted in the very definition of conservatives.
To be a conservative is to believe in the preservation or restoration of what was, or at least what one believed once was in their nation and/or state.
As we come from different states & backgrounds with different history’s and an infitie number of different times. What defines one conservatives is very easily a completely different thing that defines anther.
In regard to Grover Norquist, guilt by association is not grounds for condemnation, nor does it make his ideas in regard to a balanced budget invalid.
It is a noted fact of human nature that men are usually wrong(unsuccessful) in many areas of life while right(successful) in others. Obama is a good politician but none of us would claim that he has a lick of sense in managing anything.
Merely calling oneself a conservative does not make one so. Especially in Norquist’s case (he calls himself “libertarian” besides, IIRC).