Democrats win the Big Enchillada tonight. At least one House of Congress will be in the hands of the Democrats, a prospect that would have been unthinkable after the gloom of two years ago, and win significant pick-ups at the statehouse level as well. Only the Senate is too close to call.

Winning the House is everything. The center of GOP power since 1994, seemingly protected by a firewall of gerrymandered districts, has been busted up, and although many of tonight's winners will face some difficult partisan arithmetic in the future, the Republican Aura of Invincibility has been shattered. Even if we fall short in the remaining Senate races, the next two cycles disfavor the Republicans, where they will have to defend forty of the sixty-six seats.