Ted Cruz showed remarkable fighting spirit in the Republican presidential debate last night, lacing Donald Trump with the same kind of brilliant and witty lines that he's used in his fights against Mitch McConnell. When Trump's bogus charges against Cruz's eligibility to be president were raised, Cruz turned the tables on him, remarking that Trump had no problems with his eligibility several months earlier, giving this incredible one liner: Since September, the Constitution hasn't changed, but the poll numbers have.Trump looked very uncomfortable at that. But Cruz was just beginning. He even pointed out that Trump's own mother was not...