An Amendment is impossible. There are too many pro-choice states that would block it's ratification.

Congress can restrict abortion under section 5 of the Fourteenth Amendment. Doing so would be considered a final compromise and would end the controversy and the ability of the Republicans to rally pro-life donors and volunteers.

Catholic politicians do not support abortion, it is a constitutional, not a legislative question. They do support the premise that it is not an issue that should be legislated at the state level but have not explained that well to the hierarchy, either publicly or privately. That is a shame. Not supporting mob rule by conservatives at the state level is not supporting abortion, it is opposing mob rule, even if the mob is led by bishops. They don't support the compromise legislation above because it helps their fundraising too, but I contend that they would do better to compromise than the GOP. 

This is all off topic on DACA, of course. More GOP deflection.