Ken Buck (R) has filed paperwork for a possible 2014 senate run.
Buck, a tea party favorite who lost to Sen. Michael Bennet (D-Colo.) in 2010, filed paperwork with the Federal Election Commission Wednesday, according to the Denver Post. A campaign official told the Post Buck will officially launch his campaign with an announcement tour around the state in early September.
"Friends, today, I officially filed paperwork to run for the United States Senate in the 2014 election," said a post on Buck's official Facebook. "I'm excited about the journey ahead and invite you to join me by visiting my website and signing up for all the latest updates and opportunities. Together, we can restore a strong, responsible Colorado voice in the Senate."
Buck currently serves as the Weld County District Attorney. In early 2013, he announced that he was receiving treatment for lymphoma, a type of blood cancer. In May he announced on his official Facebook page that his cancer had gone into remission.
The tea partier has made headlines in the past for some of his more outrageous statements. In 2010, Buck said people should vote for him because he doesn't "wear high heels."
"I have cowboy boots on. They've got real bulls**t on them," Buck said. "That's Weld County bulls**t, not Washington D.C. bulls**t."
Buck also called tea partiers who question President Barack Obama's citizenship "dumbasses."
Buck isn't the only one vying to pose a GOP challenge to Udall. State Sens. Randy Baumgardner and Owen Hill have both announced they will seek the Republican nomination.
CORRECTION: The headline of this story has been updated to reflect Buck is seeking to challenge Mark Udall, not Tom Udall.