Republicans have been the primary Congressional force running interference for the old space industry, either by throwing money at the likes of ATK to build rockets that will never fly, or actively blocking SpaceX from competing with the established players on contracts.
While the big government contracting model can get crews into space, it does so at such an exorbitant price it's simply not worth it. SpaceX, or more precisely the discarding of legacy design and especially legacy contracting models that SpaceX represents, at least gives us a chance of a sustainable space program because it is far, far better value for money. It's also far more in alignment with professed Republican principles, as distinct from revealed preferences from observed behaviour.
A revived crewed space program under the old model will result in bugger-all flying, lots of money wasted, and will get cancelled soon enough. Why bother?