Given MSNBC's penchant for propagating wild theories, perhaps the network should rename itself "Conspiracies 'R Us." Rachel Maddow, MSNBC's leading host, damaged her ratings and her reputation, such as it was, by going all-in on wild Trump-Russia conspiracy theories, only to see them debunked. Last week on Morning Joe, Mika Brzezinski floated the off-the-wall notion that President Trump has "dirt" on Lindsey Graham and Marco Rubio, and is using it to blackmail them into supporting him. On Sunday morning, Joy Reid demonstrated she was not to be outdone in the kooky-conjecture department. She proclaimed that her "first thought" when she...