Former Governor Lincoln Chafee says it's likely he'll run for the U.S. Senate in a Democratic primary against incumbent Senator Sheldon Whitehouse.  Running as the Republican incumbent, Chafee lost his U.S. Senate seat to Whitehouse in 2006.  He was elected governor in 2010 as an independent, but did not run for a second term.  Two Republicans are seeking the GOP nomination to challenge for the U.S. Senate seat.