Again, it's not about parties, it's about policies. The long-term average will always be for each major party to win about half the time because if they don't they'll change their policies until they do. The question is what policies they'll adopt in order to do it -- and if your vote doesn't count, whether you're Texas or New York, your voice isn't the ones they'll be listening to when deciding what policies to adopt. What good does it do a Texas social conservative to elect a GOP candidate like Mitt Romney?
I'm not sure what your point is. Where he differs from Obama, Romney's positions are nigh-universally closer to those of Texas social conservatives aren't they? What is the biggest issue for Texas social conservatives? Abortion? What office that a Texas social conservative votes for has more impact on the future of this issue than POTUS? Would Romney's Supreme Court nominees presumably be better or worse than Obama's from the POV of Texas social conservatives?