And GOP incumbents in Georgia (Paul Coverdell) and Colorado (party-switcher Ben Nighthorse Campbell) are worth watching, though their opponents are less than intimidating.

CNN: Senate Overview

Ben Nighthorse Campbell of Colorado moved from the Democrats to the Republicans after the Senate defeat of a balanced-budget constitutional amendment, which he favored.

CNN: Party switching comes with political risks

Matt Fong in California, or Ben Nighthorse Campbell vs.

NPR: Democrats To Pick Up 4 Senate Seats �� At Least

After leaving office, Lamm abandoned politics to teach and write, returning to the stage for a brief and ignominious Senate race in 1992, in which he lost in the primary to Ben Nighthorse Campbell.

CNN: It's My Party And I'll Run If I Want To

Kenny Perry, Boo Weekley, JB Holmes, Ben Curtis and Chad Campbell were the other American victors, while debutant Hunter Mahan halved with Paul Casey.

BBC: US secure emphatic Ryder Cup win