On February 19, the Montana House State Administration Committee heard HB 436, which would establish a top-two system for all partisan office except President. No one testified for it except a state legislator. Four Libertarians testified against the bill, as did the Secretary of State.
In Montana, committees do not vote on bills at the hearing; there will probably be a committee vote within a week. Thanks to Mike Fellows for this news. UPDATE: here is a short news story about the hearing. FURTHER UPDATE: here is a much more detailed news article about the hearing.