One sunny day in January, 2013, an old man approached the White House from across Pennsylvania Avenue where he'd been sitting on a park bench. He spoke to the U.S. Marine standing guard and said, "I would like to go in and meet with President Obama." The Marine looked at the man and said, "Sir, Mr. Obama is no longer Presidentand no longer resides here."The old man said, "Okay," and walked away…