Rep. Ken Buck (R-CO) won’t be back in D.C. when the next president is sworn in, but he’s fully convinced the House vote to impeach Homeland Security Secretary Alejandro Mayorkas will backfire. “You can try to put lipstick on this pig, it is still a pig, and this is a terrible impeachment,” Buck, who isn’t running for reelection and voted against the measure on Tuesday told CNN’s Erin Burnett on “Out Front.” “It sets a terrible precedent the first impeachment of Donald Trump was a bad impeachment.” He said the reputation of congress, which is already fighting to maintain trust in the country, i…