What makes you think Mitt would give it up on guns? As a Utah resident I'm genuinely curious if I missed something. Murkowski and collins are both moderate republicans, also from extremely pro-gun states. Collins is certainly at risk of going along with some limitations. I know Bernie is liberal, but one thing that kept him from the ticket in 2016 was not being in favor of banning any guns. Neither are either of New Hampshire's senators, and neither is Angus king, last I checked. Most of new england is full of pro-gun liberals and ruger, S+W, Savage, Sig, "Remington" are important employers in their regions. I know the senators are all mostly in favor of background checks and re-closing some loopholes and escalating the punishments for domestic violence, and I know that's too much for some, but they would probably all consider the reasons against bans and other infringements for non-criminals. Most liberals could probably be convinced that banning online sales is pointless and stupid, unless they think its part of a main street revitalization programs or something. Online sales aren't the problem. It's not like a guy about to shoot his wife can get same day Amazon delivery of a gun. Mass shooters aren't getting their guns directly from Midway to their house.