I don't necessarily agree with Peggy Noonan's details, but the big picture is spot-on.
This is the heart of the matter:
We are at a remarkable moment. We have an open, 2,000-mile border to our south, and the entity with the power to enforce the law and impose safety and order will not do it. Wall Street collapsed, taking Main Street's money with it, and the government can't really figure out what to do about it because the government itself was deeply implicated in the crash, and both political parties are full of people whose political careers have been made possible by Wall Street contributions. Meanwhile we pass huge laws, bills so comprehensive, omnibus and transformative that no one knows what's in them and no one—literally, no one—knows how exactly they will be executed or interpreted. Citizens search for new laws online, pore over them at night, and come away knowing no more than they did before they typed "dot-gov."
Go read the rest. I believe it is the "common ground" Left and Right can (TEA) Party over.