Republicans simply need to vote "present" --- regardless what happens, the media won't report it fairly. The upside is that those who vote in mid-terms tend to be more informed than what we've seen in the presidential elections.
So let the Dems have their way. Handle it the way that more and more states are responding to Obamacare --- refusing to set up exchanges on Obamacare, and letting HHS figure it out.
Chris Christy just said "you do it" earlier tonight by vetoing S-2135. The vote on that was down party lines, and there aren't enough votes to override the veto (27 votes in the Senate, only 21 voted for; 54 votes in the General Assembly, only 43 voted for).
That brings the list up to 18 states who have said "you can build it":
Where this gets interesting.... the law as written only provides taxpayer subsidies to exchanges which are state run. With no provision for subsidies in federally run exchanges, per the letter of the law, the employer mandate is not enforceable. That's why HHS came out last week and said that federally run exchanges will now carry a ~3.5% penalty/premium vs. state run exchanges.