In the past, those at the political fringe were limited in their ability to communicate beyond their cliques. Now, with social media, the shouters on the left and the right have taken center stage with the largest megaphone in history, the Internet.USA Today proclaimed in a front-page headline last week that Americans are not all that upset the federal government is functioning at a dead slow pace. “More Americans say polarization in Congress is good,” the newspaper proclaimed. There can be no question that there is today, and always has been, a substantial group of folks, mostly conservative, who think...