Scott Gessler asks thousands of registered voters to prove they are citizens

Nearly 4,000 registered voters in Colorado received a letter this week from Secretary of State Scott Gessler asking that they prove their citizenship or otherwise remove themselves from voter rolls. Gessler, who says he is preventing fraud, identified these residents through the Division of Motor Vehicles -- but watchdog groups worry that the information could be flawed and the letters may intimidate legal voters from going to the polls.