"This was a pretty shameful day for Washington," he said. "This effort is not over. ... If this Congress refuses to listen to the American people and pass common-sense gun legislation, then the real impact is going to have to come from the voters."President Obama Paul Kevin Curtis was arrested at his home in Corinth, Mississippi, and is the mailings of the three letters sent through the U.S. Postal Inspection Service which contained a granular substance that preliminarily tested positive for ricin,The letters were addressed  SenatorWicker, the White House and a Mississippi justice official