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Buck, who lost a senate bid to Michael BennetMichael Farrand BennetOvernight Energy: EPA moves to limit financial pressure on 'forever chemical' manufacturers | California sues Trump over water order| Buttigieg expands on climate plan Buttigieg expands on climate plan with new proposals 2020 race goes national in sprint to Super Tuesday MORE (D-Colo.) in 2010, will seek to unseat Colorado’s other incumbent senator, Mark UdallMark Emery UdallDemocrats will win back the Senate majority in 2020, all thanks to President Trump Poll: Trump trails three Democrats by 10 points in Colorado The Hill's Morning Report — Trump and the new Israel-'squad' controversy MORE (D-Colo.), in 2014.

According to the Denver Post, Buck will launch his campaign and tour the state in early September.

Buck, a district attorney, joins state Sens. Randy Baumgardner and Owen Hill in seeking the Republican nomination.

In 2010, political watchers believed Bennet, who was appointed by then-Gov. Bill Ritter (D) in 2009 to fill the seat left by Ken Salazar (D), who became secretary of the Interior, was vulnerable to a Republican challenger in a year that a wave election gave the GOP a majority in the House.

But Bennet squeaked out a victory over Buck, whose campaign was plagued by controversial comments. Buck believes global warming is a hoax, and at one point appeared to liken homosexuality to alcoholism.