The wiggle room is simple. It doesn't matter what Michigan's constitution says, because our constitution is quite often ignored.
For example, Article IV, Section 16:
"§ 16 Legislature; officers, rules of procedure, expulsion of members.
"Sec. 16.
"Each house, except as otherwise provided in this constitution, shall choose its own officers and determine the rules of its proceedings, but shall not adopt any rule that will prevent a majority of the members elected thereto and serving therein from discharging a committee from the further consideration of any measure. ..."
But in 2008, a motion to discharge the House Judiciary Committee from sitting on the Parental Rights Joint Resolution, so that it could be sent on to the voters, was thwarted exactly in this manner, despite the vast majority of legislatures having cosigned the measure.
