What is William McMahon?
{{Infobox officeholder | name = Rt Hon Sir William McMahon | image = William McMahon 1966.jpg | caption = William McMahon in 1966 | order = 20th [[Prime Minister of Australia]] | term_start = 10 March 1971 | term_end = 5 December 1972 | predecessor = [[John Gorton]] | successor = [[Gough Whitlam]] | birth_date = {{birth date|df=yes|1908|2|23}} | birth_place = [[Sydney]], [[New South Wales]], [[Australia]] | death_date = {{death date and age|df=yes|1988|3|31|1908|2|23}} | death_place = Sydney, New South Wales, Australia | party = [[Liberal Party (Australia)|Liberal]] | spouse = Sonia McMahon<br>(m. 1965-1988, his death) | children = Melinda, [[Julian McMahon|Julian]], Deborah }} '''Sir William McMahon''' (23 February 1908 – 31 March 1988) was the 20th [[Prime Minister of Australia|Prime Minister]] of [[Australia]]. He was elected to the [[Australian parliament]] in 1949, and stayed as Member for [[Division of Lowe|Lowe]], in [[Sydney]], for 33 years. He challenged [[John Gorton]] for the leadership of the [[Liberal Party of Australia]] in 1971 and won. He was 63 years old. He lost the next election in December 1972 to [[Gough Whitlam]] of the [[Australian Labor Party]]. This made him the first Prime Minister not to win an election since Labor's [[Ben Chifley]] (who lost in 1949). McMahon was married to (Lady) [[Sonia McMahon]] from 1965 until his death from [[cancer]]. Actor [[Julian McMahon]] is their son.<ref>{{cite web|url=http://primeministers.naa.gov.au/primeministers/mcmahon/|title=About - William McMahon (10 March 1971 – 5 December 1972) and Sonia McMahon|first=Parkes|last=corporateName=National Archives of Australia; address=Queen Victoria Terrace|website=primeministers.naa.gov.au|access-date=10 January 2011|archive-date=22 June 2013|archive-url=https://web.archive.org/web/20130622113101/http://primeministers.naa.gov.au/primeministers/mcmahon/|url-status=dead}}</ref> The Liberal party had won lots of elections since 1949, but had some popularity