Question: For which political party does Mark Christopher Butler represent an electoral division in the state of South Australia, which includes Torrens Island and Garden Island?

Context paragraphs:
Torrens Island Power Station: Torrens Island Power Station is located on Torrens Island, near Adelaide, South Australia and is operated by AGL Energy.  It burns natural gas in eight steam turbines to generate up to 1,280 MW of electricity.  The gas is supplied via the SEAGas pipeline from Victoria, and the Moomba Adelaide Pipeline System (MAPS) from Moomba in the Cooper Basin.  The station is capable of burning either natural gas or fuel oil.  It is the largest power station in South Australia and was formerly the largest single power station user of natural gas in Australia.

Mark Butler: Mark Christopher Butler (born 8 July 1970) is an Australian politician, representing the electoral division of Port Adelaide in the Commonwealth Parliament since 2007.  He is the Federal President and a member of the Australian Labor Party.

Electoral district of Torrens: Torrens is an electoral district of the House of Assembly in the Australian state of South Australia.  Located along the River Torrens, and named after Robert Richard Torrens, a 19th-century Premier of South Australia, and also the founder of the "Torrens title" land registration system.  Torrens is an 18.8 km² urban electorate in Adelaide's north-east.  It includes the suburbs of Greenacres, Hampstead Gardens, Hillcrest, Holden Hill, Northgate, Oakden and Windsor Gardens as well as parts of Dernancourt, Gilles Plains, Hope Valley, Klemzig and Northfield.

Torrens Island Conservation Park: Torrens Island Conservation Park is a protected area located on Torrens Island in South Australia about 3.9 km north-northeast of Port Adelaide.  The conservation park covers the majority of Torrens Island down to low water with exception to the land associated with the former quarantine station and the Torrens Island Power Station.  The east side of the conservation park immediately adjoins the Barker Inlet-St Kilda Aquatic Reserve.  The conservation park is reported as protecting ‘areas of mangrove forest, samphire shrubland and sand dune systems home to vulnerable and threatened species such as the Australasian bittern, the fairy tern and the white-bellied sea eagle’.  The conservation park is classified as an IUCN Category III protected area.

Torrens Island Concentration Camp: The Torrens Island Internment Camp was a World War I concentration camp, located on Torrens Island in the Port River Estuary near Adelaide in South Australia.  The camp opened on 9 October 1914 and held up to 400 men of German or Austro-Hungarian background, or crew members of enemy ships who had been caught in Australian ports at the beginning of the war.  They were held without trial under the provisions of the "War Precautions Act 1914".

Barker Inlet: The Barker Inlet is a tidal inlet of the Gulf St Vincent in Adelaide, South Australia, named after Captain Collet Barker who first sighted it in 1831.  It contains one of the southernmost mangrove forests in the world, a dolphin sanctuary, seagrass meadows and is an important fish and shellfish breeding ground.  The inlet separates Torrens Island and Garden Island from the mainland to the East and is characterized by a network of tidal creeks, artificially deepened channels, and wide mudflats.  The extensive belt of mangroves are bordered by samphire saltmarsh flats and low-lying sand dunes, there are two boardwalks (at Garden Island and St Kilda), and ships graveyards in Broad Creek, Angas Inlet and the North Arm.

Barker Inlet Power Station: Barker Inlet Power Station is a proposed power station in South Australia.  It was announced on 7 June 2017 by AGL Energy to replace part of its aging Torrens Island Power Station and would be built alongside the existing station on Torrens Island in the northwestern suburbs of Adelaide.  Construction was expected to start in the third quarter of 2017, with commissioning in the first quarter of 2019.

Quarantine Power Station: Quarantine Power Station is a gas-powered electricity generation facility near the northern end of Torrens Island in the northwestern suburbs of Adelaide, South Australia.  It is at the opposite end of Torrens Island from AGL Energy's Torrens Island and Barker Inlet power stations.  It gets its name from the Torrens Island Quarantine Station which was nearby.

HMAS Stirling: HMAS "Stirling" is a Royal Australian Navy (RAN) base that is part of fleet Base West situated on the west coast of Australia.  The base is located on Garden Island in the state of Western Australia, near the city of Perth.  Garden Island also has its own military airport on the island (ICAO: YGAD) .  HMAS "Stirling" is currently under the command of Captain Brian Delamont, RAN.

Division of Port Adelaide: The Division of Port Adelaide is an Australian electoral division in the state of South Australia.  The 181 km² seat extends from St Kilda in the north to Grange Road and Findon in the south with part of Salisbury to the east.  Suburbs include Alberton, Beverley, Birkenhead, Cheltenham, Findon, Kilkenny, Largs Bay, Mansfield Park, North Haven, Ottoway, Parafield Gardens, Paralowie, Pennington, Port Adelaide, Queenstown, Rosewater, Salisbury Downs, Semaphore, Woodville, West Croydon, and part of Seaton.  The seat also includes Torrens Island and Garden Island.

Supporting paragraphs: Mark Butler Division of Port Adelaide
Answer: Australian Labor Party