Republican Rep. Ken Buck of Colorado abruptly announced on Tuesday he would resign from Congress in the coming days but offered no explanation. The sudden departure of the long-serving House Republican comes after he had already announced just months ago he would not seek re-election at the end of his current term. In a succinct statement he posted on the social media platform X, Buck said he would be calling it a career after next week. “It has been an honor to serve the people of Colorado’s 4th District in Congress for the past 9 years. I want to thank them for their support and encouragemen…