Republicans aren't "catching up" in polarization, they invented it during the Clinton Administration, when the defeat of a GOP incumbent president sent the GOP into a frenzy. The "Arkansas Project" was funded by right wing billionaire/millionaires, and was responsible for all of the nonsensical conspiracies that ended up going nowhere, like Whitewater, "Filegate," the Vince Foster "suicide" and much more. It got worse under W, and went ballistic during Obama. We liberals are novices to the kind of polarizing actions that conservatives have injected into American politics. We'd better wise up and catch up to the right. We learned that you have to go for the gut, it's not enough to have the best policies and the thoughtful, reasoned approach. People vote with their gut, even when it's against their interests and against American principles.