Four Colorado Republicans running for the U.S. Senate did little to differentiate themselves in a forum where they agreed on every topic.

Talking before a friendly conservative crowd in Lakewood, the Republicans saved their barbs for Democrats in Washington. They didn't criticize each other, and none of them even mentioned Democratic Sen. Michael Bennet, who holds the seat they're after and is facing re-election next year.

Former lieutenant governor Jane Norton said Congress is spending too much. The sentiment was echoed by the other candidates: Weld County District Attorney Ken Buck, former state Sen. Tom Wiens and business Cleve Tidwell.

All said the key to Republican success next year was to seize on dissatisfaction with Washington.