David Axelrod: “Joe Manchin tried in 2013, after Newtown to make all commercial sales of guns subject to background checks.”

There's no doubt about that. But I also want to say this. You know, all presidents sort of feed off of perceptions of the person who came before and they want to position against what people found lacking in the person that came before.

The nature of presidential politics is the bar gets raised constantly.

The place where it has influenced politics is in Canada. Now, Justin Trudeau is not -- he's stepping down. He's going to step down. But there's going to be an election in the next few days for the new Liberal Party leader and then there…

I think there's a lot of concern among Republican officeholders. Governor Pawlenty could speak more readily to this than me.