The Republican Party’s chosen nominee for lieutenant governor of Indiana deleted a years-old tweet that made a crude joke about autism and the Kentucky Downs thoroughbred horseracing track. The December 2011 tweet by Micah Beckwith, highlighted by Politico national politics correspondent Matt Wren, said, “Driving through Kentucky and passed a sign that said ‘Kentucky Downs’ and @Joshuabradford asks ‘Is that a form of Kentucky autism??'” Presumably, Beckwith was drawing a connection between the name “Kentucky Downs” and Down Syndrome, a chromosomal disorder that can result in physical abnormali…