The same is true of Pryor in Arkansas, where a party official says no one has expressed legitimate interest in challenging the incumbent Democrat and if someone were to, it wouldn't likely be about his gun vote.
"It's just a small, small thing even in our own party here," the official says.
In Montana, which will have an open Democratic primary following Baucus' announcement, a party official says there hasn't been any activity that indicates his no vote on the legislation is inspiring them to run.
"The issues that will influence candidates on either side to run are more likely to be the issues that determined the last election, Medicare, Social Security and creating jobs," he says.
Top lawmakers say they expect the background check measure to come up for a vote again, perhaps with some tweaks. And some Republicans, such as Sen. Jeff Flake, R-Ariz., who saw a steep approval drop after opposing the measure initially say they could be open to supporting an updated version.