[Kenny]

I’ll try to look up polls etc. on those states to see how strongly they oppose Obamacare.

Most Americans oppose it so even if they’re Dems, you’d think they’d go along with that.

[JediJones]

Apparently amendments can also be ratified by state conventions, not just state legislatures. I’m not quite sure how such a convention works, but it was used once to ratify an amendment. A convention of states has never been used to propose an amendment before, but it is the alternative way to do it other than having the House and Senate propose them.

http://www.usconstitution.net/constam.html

The Constitution, then, spells out four paths for an amendment:

Proposal by convention of states, ratification by state conventions (never used)
Proposal by convention of states, ratification by state legislatures (never used)
Proposal by Congress, ratification by state conventions (used once)
Proposal by Congress, ratification by state legislatures (used all other times)