— Incumbent Marilyn Musgrave

Marilyn Musgrave

Marilyn Neoma Musgrave , American politician, is a former Republican member of the United States House of Representatives who served from 2003 to 2009, representing the 4th District of Colorado....

 (R), a Republican who was the chief sponsor of the Federal Marriage Amendment

Federal Marriage Amendment

The Federal Marriage Amendment H.J. Res. 56 was a proposed amendment to the United States Constitution which would have limited marriage in the United States to unions of one man and one woman...

 won a surprisingly close 45.6% to 43.1% reelection in 2006 despite the Republican-leaning nature of her eastern Colorado district. Her district consists of all of Eastern Colorado well east of Denver

Denver, Colorado

The City and County of Denver is the capital and the most populous city of the U.S. state of Colorado. Denver is a consolidated city-county, located in the South Platte River Valley on the western edge of the High Plains just east of the Front Range of the Rocky Mountains...

, and northeastern Colorado around Fort Collins

Fort Collins, Colorado

Fort Collins is a Home Rule Municipality situated on the Cache La Poudre River along the Colorado Front Range, and is the county seat and most populous city of Larimer County, Colorado, United States. Fort Collins is located north of the Colorado State Capitol in Denver. With a 2010 census...

 and Loveland

Loveland, Colorado

Loveland is a Home Rule Municipality that is the second most populous city in Larimer County, Colorado, United States. Loveland is situated north of the Colorado State Capitol in Denver. Loveland is the 14th most populous city in Colorado. The United States Census Bureau that in 2010 the...

.

Musgrave's opponents were Democratic state representative Angie Paccione

Angie Paccione

Angela Veronica "Angie" Paccione is a former Colorado legislator and was a 2006 Congressional candidate.A college basketball player at Stanford and professional basketball player in the 1980s, Paccione became a high school coach, teacher and administrator before earning a Ph.D...

 and former Ronald Reagan

Ronald Reagan

Ronald Wilson Reagan was the 40th President of the United States , the 33rd Governor of California and, prior to that, a radio, film and television actor....

 United States Environmental Protection Agency

United States Environmental Protection Agency

The U.S. Environmental Protection Agency is an agency of the federal government of the United States charged with protecting human health and the environment, by writing and enforcing regulations based on laws passed by Congress...

 appointee Eric Eidsness

Eric Eidsness

'— Incumbent Marilyn Musgrave , a Republican who was the chief sponsor of the Federal Marriage Amendment won a surprisingly close 45.6% to 43.1% reelection in 2006 despite the Republican-leaning nature of her eastern Colorado district...

, a former Republican who entered the race as a Reform Party

Reform Party of the United States of America

The Reform Party of the United States of America is a political party in the United States, founded in 1995 by Ross Perot...

 candidate. When Paccione entered the race in September 2005 the race was not widely regarded as competitive outside of the Fourth District, but the Paccione campaign successfully raised nearly $2 million, and the results were relatively close. The Cook Report called it a toss-up late in the campaign.

Musgrave's close margin of victory gives her the distinction of receiving the lowest percentage of the vote of any member of Congress.

Result