I still belong to the AMA and the American Academy of Family Physicians, despite their postitions on post-coital or morning after pills. I rejoined the AMA after a couple of years out, as a matter of fact.
I sure wasn't making a difference on the outside and the AMA continued to present themselves as my voice in politics, the media, and medical policy.
However, within the organization, I hope to be "salt and light." I may not have made much of a dent, yet, but I will continue to read the literature, speak up and propose new policies at both education and business meetings. Turn a mind here, convince a heart, there. That's all any of us can do.
I think that is probably the wisest course. My post was a few weeks ago but I was arguing that it is pretty difficult to make a living and avoid all pro-abortion people, groups and employers. That said, I quit the ABA a long time ago when it was leaning more and more to the left. It also pretends to be the voice for all but it is losing the battle and becoming somewhat irrelevant. I think the AMA has a lot more pull than the ABA these days and I have no problem with your rejoining it. Best of luck in making a difference! Oh, and doc, I have this little ache . . . ;)