Several rallies at the state Capitol were timed to coincide with the Legislature’s only session day this month.
The largest was a group of about 150 abortion rights advocates protesting a package of bills before the state Senate.
The bills call for strict regulations on abortion providers.
One of the speakers was Renee Chelian. She works for a group of family planning clinics in metro Detroit. Chelian says protests have slowed down the bills after they cleared the state House last month.
Election season gets off to an early start this year for the Michigan House.
Voters head to the polls Tuesday in two districts to fill vacancies left by former lawmakers. One seat covers a portion of Genesee County, while the other covers part of Oakland County.
The winners would have to run again to get full, two-year terms later in the year.
Republicans enter the 2012 election season with a 62-46 advantage over Democrats in the House.