State Rep. Mike Moon (R) became the latest GOP legislator to join the effort to remove Nixon, after state Rep. Nick Marshall (R) put the wheels in motion earlier this month.
According to the St. Louis Post-Dispatch, Moon's articles of impeachment cited Nixon's failure to call a special election to fill a vacant congressional seat in Missouri. Marshall, on the other hand, was driven to take action after Nixon issued an executive order last year permitting same-sex couples married in other states to file joint federal income tax returns.
Nixon said Thursday that he'd like the state to vote on same-sex marriage, adding that he'd vote to lift the ban on gay nuptials.
The governor, elected to a second term in 2012, dismissed the impeachment effort as a "publicity stunt."