Speculation already on who will fill Levin's seat

Published On: Mar 07 2013 10:55:56 PM EST   Updated On: Mar 07 2013 11:01:15 PM EST

U.S. Democratic Senator Carl Levin's decision not to seek re-election in 2014 will leave behind a long and rich legacy. Speculation already is building about who is going to make a run for his seat.