Rep. Mark Udall keeps his big lead in the Colorado Senate race, according to a new poll by a Colorado-based pollster. The Ciruli Associates poll, conducted for the Economic Development Council of Colorado, tested 501 likely voters for a margin of error of +/- 4.4%. Democrat Udall and Republican ex-Rep. Bob Schaffer were tested.

General Election Matchup
Udall.............45
Schaffer.......38

Obama..........44
McCain.........43

Pollster Floyd Ciruli reports Udall has a big lead on the state's Western Slope, a traditionally Republican region of the state where Democrats have recently made big gains at the Congressional and legislative level.