President of the Senate (Australia)
The position is provided for by Section 17 of the Constitution of Australia. The Senate elects one of its members as president at the start of each new term, or whenever the position is vacant. This is usually—though not necessarily—a member of the party or coalition that holds the most seats in the Senate. The largest party in the Senate is not always the governing party, as government is determined by the House of Representatives. The President of the Senate and the Speaker of the House of Representatives may consequently be from different parties.
Margaret Reid (politician)
On 5 May 1981, Reid was elected by a joint sitting of the Australian Parliament to fill a casual vacancy in the representation of the Australian Capital Territory in the Senate, following the sudden death of her close friend, Senator John Knight. This was the first of only two occasions on which a Senate casual vacancy was filled in this manner, as the law was later changed to provide for a replacement senator to be appointed by the relevant territory (ACT or NT) legislative assembly.