It took a building to bring down Donald Trump.
Unleashing the angriest of his supporters this week against the U.S. Capitol may have been only the culmination of Trump's 60-month campaign against the Washington establishment.
But it was also its undoing. And his.
When the crowd that Trump whipped up on the Ellipse marched up the National Mall with his blessing and encouragement, they became a mob assaulting and invading the Capitol.