Barack Obama is going to have to school Katy Tur on the famous sons of all the 57 states . . . If ever there were a famous Virginian, it is George Washington. Born and raised in Virginia, Mount Vernon was, of course, his historic home. Yet somehow, a confused Katy Tur has claimed that Washington was a "native son of New York." Her embarrassing gaffe occurred today on MSNBC, as Tur handed off the MTP Daily hour to Ari Melber and The Beat. ARI MELBER: Hi, Katy. I wanted to wish you a happy Presidents Day. TUR: You know,...