Topeka Capital-Journal House Democrats said Tuesday they had formally filed a complaint against Rep. Aaron Coleman, of Kansas City, Kan., to jumpstart the expulsion proceedings to boot the controversial lawmaker from office. The move comes after Coleman, who unseated longtime incumbent Democrat Stan Frownfelter in the August partisan primary election, announced earlier in the day that he would change his registration from Democrat to independent. House Democrats have refused to give Coleman committee assignments and have even taken the extraordinary step of denying him office space, something he has vocally opposed on Twitter. That culminated in the party switch, which Coleman announced to the public Tuesday morning.