Information: - Melbourne is the capital and most populous city of the Australian state of Victoria, and the second-most populous city in Australia. The name "Melbourne" refers to an urban agglomeration spanning which comprises the broader metropolitan area, as well as being the common name for its city centre. The metropolis is located on the large natural bay of Port Phillip and expands into the hinterlands towards the Dandenong and Macedon mountain ranges, Mornington Peninsula and Yarra Valley. Melbourne consists of 31 municipalities. It has a population of 4,529,500 , and its inhabitants are called Melburnians. - The Yarra Valley is the name given to the region surrounding the Yarra River in Victoria, Australia. The river originates approximately 90 kilometres east of the Melbourne central business district and flows towards it and out into Port Phillip Bay. The name Yarra Valley is used in reference to the upper regions surrounding the Yarra River and generally does not encompass the lower regions including the city and suburban areas, where the topography flattens out, or the upper reaches which are in inaccessible bushland. Included in the Yarra Valley is the sub-region of Upper Yarra (or the Upper Yarra Valley) which encompasses the towns of the former Shire of Upper Yarra in the catchment area upstream of and including Woori Yallock. The Yarra Valley is a popular day-trip and tourist area, featuring a range of natural features and agricultural produce, as well as the Lilydale to Warburton Rail Trail. - Barry Thomas Cunningham (born 26 October 1939) was an Australian politician. Born in Pakenham, Victoria, he was a dairy and potato farmer and an agricultural contractor before entering politics. In 1980, he was elected to the Australian House of Representatives as the Labor member for McMillan, defeating Barry Simon of the Liberal Party, who had been deprived of Democratic Labor Party preferences due to his views on abortion. He was defeated in 1990, but was re-elected in 1993, before being defeated again in 1996. - John Peter Riggall ( born 10 May 1941 ) was an Australian politician . Born in Melbourne , he was a dairy farmer and grazier before entering politics . He was elected to the Australian House of Representatives in 1990 as the Liberal member for McMillan , defeating Labor 's Barry Cunningham . Riggall was defeated by Cunningham in 1993 . Given the information, choose the subject and object entities that have the relation of 'member of political party'.
Answer:
john riggall , liberal party