There is no way the Reps can defund or repeal Obamacare now. However, they can firmly affix blame for the diaster once again right before full implementation.
Americans by and large only make a stink when they feel the pain. Impliment it now, fully. Every traffic stop will include an inquiry about your compulsery health insurance. Let the IRS go from house to house in full body armor making sure everyone is signed up.
If the govt shuts down why would the Pubs be hurt?
Who in the govt, besides military personnel, is a part of the Pub base?
I believe the only issue is will the military get paid.