Political rhetoric, left and right, seems steadily worse. "Kill Bush" T-shirts and bags were offered for sale last week on the Internet, then quickly removed after protests. In Chicago, a college art show featured a series of mock postage stamps showing Bush with a gun to his head. The unhinged left has long flirted with the theme of killing presidents, from the 1992 Manhattan posters urging the murder of the first President Bush to the "that pig Bush must die" message on a fringe website last week. Columnist Michelle Malkin offered some acid comments on the "pro-assassination left," citing anti-Bush...