washingtonpost.com – Sen. Mary Landrieu (D-La.) has participated in a keg stand. She has run this desperate ad. She lost an energy committee chairmanship that she often touted, when the GOP took the Senate on Nov. 4. She has clashed — in front of reporters — with a leader of her party. That same party basically abandoned her in her runoff campaign for a fourth term. But on Tuesday, she suffered the biggest indignity of her 2014 campaign, and possibly of her political career.