I have conservative views, both fiscally and socially. And even here in Louisiana I can't discuss them in the work place.
I'm going to go out on a limb here and suggest this is largely due to the desire to keep politics out of your workplace, not because there is some huge desire to not hear conservative views. I can;t imagine you work at a place where your views would not be echoed by a HUGE percentage of people.
I, on the other hand, have to be VERY VERY careful with whom I discuss my religious beliefs, for instance...even in social situations, because to say you're an atheist in South Louisiana is not a smart move.