Maybe he doesn't like the sound of hundreds of thousands of motorcycle riding freedom-fighters roaring through the streets of D.C. all day and night for four days?Barack Obama is turning his back on the Vietnam veterans of Rolling Thunder who will gathering in Washington, D.C. this Memorial Day weekend for their 23rd annual demonstration to remind the nation of those servicemembers still missing or held as prisoners of war.In addition to skipping out on his duties at Arlington National Cemetery so he can vacation at the family mansion in Chicago, Obama will be cancelling what, under President George W. Bush,...