Thousands of people crowded the Edmund Pettus Bridge in Selma yesterday to remember what became known as “bloody Sunday.” Voting marchers in 1965 were attacked by State Troopers and a Sheriff’s posse armed with clubs and tear gas. The weekend observance was attended by President Obama and the children of Dr. Martin Luther King, Junior. APR news director Pat Duggins and reporter Stan Ingold teamed up to bring us this audio postcard…