IIRC, he was in support of the AWB and the mag ban and the Brady Bill. I think he's a stealth RINO on the 2nd Amendment. He's not stupid...but remember where a vast majority of the nations doctors (he's an M.D.) stand on guns....very much against. It's only a slender sliver of Docs that are pro-gun. Some are neutral but lean against. But he's seen the damage that the NRA and other gun groups have done to Presidential contenders, so he sees this as a chance to shore up relations with the gun folks. I don't trust him.
This bill isn't the sweetheart deal you might think, either. It just maintains that federal funds wouldn't be used to confiscate firearms. Also if gun grabs are already a part of state law, it's okay by the feds. So the Ray Nagins of the country have to stash away some part of the parking ticket revenue for house to house searches and SWAT team O/T....hey it's doable.
I might believe that about pediatricians, mainly because they are mostly women, but do you have any links supporting that claim for the rest?