U.S. Sen.-elect Mark Udall, right, joins his wife, Maggie Fox, in greeting supporters as they celebrate during the Democrats' gala in Denver on Tuesday, Nov. 4, 2008. (AP Photo/David Zalubowski)

U.S. Rep. Mark Udall, D-N.M., and his wife Maggie Fox watch early returns from Tuesday's election on television in Denver, Colo., Tuesday, Nov. 4, 2008. Mark Udall won the U.S. Senate seat race against Republican Bob Schaffer. (AP Photo/Ed Andrieski)

In this undated photo combination, Democratic Senate candidate Mark Udall, D-Colo., left, and his cousin Democratic Senate candidate Tom Udall, D-N.M. are shown. Mark Udall likes to say his pursuit of public service and environmental causes is in his DNA. His cousin Tom could say that, too. The sons of the late Rep. Morris "Mo" Udall and his brother, former Interior Secretary Stewart Udall, both Democrats, have commanding leads in races to take over U.S. Senate seats long held by Republicans. (AP Photos)

In these file photos Rep. Mark Udall, D-Colo., left, greets people in the State Capitol on the opening day of the 2008 legislative session in Denver Jan. 9, 2008, and, right, Bob Schaffer addresses the assembly of the 2008 Colorado Republican Convention before accepting the party's nomination for the U.S. Senate May 31, 2008. Public polls show Democratic Udall in a dead heat in the race against Schaffer to succeed retiring GOP Sen. Wayne Allard. (AP Photo/Files)