FILE - Rep. Ken Buck, R-Colo., walks out of the House chamber, Feb. 6, 2024, at the Capitol in Washington. A panel of Colorado Republicans will select a candidate Thursday, March 28, who will likely serve out the final months of Buck?s term ? and could pose a challenge to Rep. Lauren Boebert?s bid for another term in Congress. (AP Photo/J. Scott Applewhite, File)