http://www.legislature.mi.gov/(S(3xw...-Article-IV-27
90% of Michigan bills get immediate effect, so failing to get immediate effect indicates an unusual degree of dissent in the Legislature.Article IV § 27
STATE CONSTITUTION (EXCERPT)
CONSTITUTION OF MICHIGAN OF 1963
§ 27 Laws, effective date.
Sec. 27.
No act shall take effect until the expiration of 90 days from the end of the session at which it was passed, but the legislature may give immediate effect to acts by a two-thirds vote of the members elected to and serving in each house.