Funny thing, the law in question does not mention sexual orientation and merely codifies in law first amendment religious liberty guarantees.
If Pence wants to forever destroy his chances for a POTUS candidacy, he will sign some explicit LGBTBS speshul rights law. His best bet is to show some scrote and stand up to the homofascist onslaught. Capitulation to the bent sons and daughters of stalinism is a fool's erand.
The MSM is already set against GOP candidates. One more minor issue will not make or break them. What the GOP needs to do is to break the MSM and power centers of the left: MSM, academia, Hollywood.