Sen. Arlan Meekhof, R-West Olive, will be the new state Senate majority leader in 2015.
Republican senators chose Meekhof to replace term-limited Sen. Randy Richardville to lead their caucus.
Republicans will likely add one seat to their 26-12 majority in the Senate next year, although Democrats are considering a recount in one race.
Senate Democrats selected Sen. Jim Ananich of Flint as the next state Senate minority leader. He will replace term-limited Sen. Gretchen Whitmer.
Republican state Representatives will choose a new state House Speaker this afternoon.