New York Times:
Gov. Chris Christie of New Jersey endorsed Donald J. Trump on Friday, a major turn in a wild race and one that gives the New York businessman a major boost as he heads into the pivotal Super Tuesday contests.
Mr. Christie was a candidate himself until he came in sixth place in New Hampshire’s primary. Seeing his political career facing an abrupt conclusion at the end of a second term as governor following his faded presidential campaign, he was said to be deeply angry with Senator Marco Rubio, according to three people with direct knowledge of his thinking. He blames Mr. Rubio’s “super PAC” for halting his momentum in New Hampshire in December with a string of slash-and-burn ads.
The endorsement came a day after Mr. Rubio, in a withering debate performance, turned his guns on Mr. Trump for the first time, and followed up this morning, calling Mr. Trump a “con artist.”