Question: The Portillo moment was the dramatic declaration of the result for the Enfield Southgate constituency in the 1997 UK general election, which British Labour and Co-operative Party politician, defeated the sitting MP?

Context paragraphs:
Andy Sawford: Andrew Sawford (born 15 March 1976) is a British Labour and Co-operative Party politician.  He was the Member of Parliament (MP) for Corby from a 2012 by-election until the 2015 general election.

Tulip Siddiq: Tulip Rizwana Siddiq, (Bengali: টিউলিপ রেজওয়ানা সিদ্দীক ; born 16 September 1982) is a British Labour Party and Co-operative Party politician.  She was elected Member of Parliament (MP) for Hampstead and Kilburn at the 2015 general election.  She is vice-chairwoman of the All-Party Parliamentary Group against Antisemitism and a member of the Women and Equalities Select Committee.  She was previously a councillor for Regent's Park and Cabinet Member for Culture and Communities in Camden Council.

Will Nally: Will Nally (13 December 1914 – 4 August 1965) was a British Labour and Co-operative Party politician.  He was elected as Member of Parliament (MP) for the Bilston constituency at the 1945 general election.  He stood down from the seat at the 1955 general election, citing the problem of splitting his time between his constituency in Wolverhampton, Parliament at Westminster, and his family home elsewhere in the country.  He was nominated for selection for the seat of Manchester Gorton but was not short-listed.

Meredith Titterington: Meredith Farrer Titterington (1886 – 28 October 1949) was a British Labour and Co-operative Party politician.  He was elected as Member of Parliament (MP) for Bradford South at the 1945 general election, but died in office in 1949, aged 63.

John Lewis (British politician): John Lewis (14 December 1912 – 14 June 1969) was a British Labour Party politician, elected as Member of Parliament (MP) for the two-seat constituency of Bolton at the 1945 general election.  The constituency was divided in a boundary review for the 1950 general election, when he was returned as MP for the new Bolton West constituency.  At the 1951 general election he lost his seat to the Liberal candidate Arthur Holt.

Paul Sweeney: Paul John Sweeney (born 16 January 1989) is a Scottish Labour & Co-operative Party politician.  He has been the Member of Parliament (MP) for Glasgow North East since the snap 2017 general election, where he defeated sitting MP Anne McLaughlin of the SNP by 242 votes.

Enfield Southgate in the 1997 general election: Michael Portillo's loss of the Enfield Southgate seat in the 1997 general election to Stephen Twigg came as a shock to many politicians and commentators, and came to symbolise the extent of the Labour landslide victory.  Portillo had been widely expected to contest the Conservative leadership after the General Election, which without a Commons seat he was unable to do.

Stephen Twigg: Stephen Twigg (born 25 December 1966) is a British Labour and Co-operative Party politician who has been Member of Parliament (MP) for Liverpool West Derby since 2010.  He previously served as the Member of Parliament for Enfield Southgate from 1997 to 2005.

Portillo moment: The Portillo moment was the dramatic declaration of the result for the Enfield Southgate constituency in the 1997 UK general election, at around 3:10 a.m. on 2 May 1997.  The Labour candidate Stephen Twigg, then relatively unknown, defeated the sitting MP, Conservative cabinet minister Michael Portillo.  The result was perceived as a pivotal indication that the Conservatives would be voted out of office after 18 years, and that New Labour would win the election by a substantial majority.

Clement Attlee: Clement Richard Attlee, 1st Earl Attlee, {'1': ", '2': ", '3': ", '4': "} (3 January 1883 – 8 October 1967) was a British Labour politician who served as Prime Minister of the United Kingdom from 1945 to 1951 and Leader of the Labour Party from 1935 to 1955.  In 1940, Attlee took Labour into the wartime coalition government and served under Winston Churchill, becoming the first person to hold the office of Deputy Prime Minister of the United Kingdom.  He went on to lead the Labour Party to an unexpected landslide victory at the 1945 general election; forming the first Labour majority government, and a mandate to implement its postwar reforms.  The 12.0% national swing from the Conservatives to Labour was unprecedented at that time and remains the largest ever achieved by any party at a general election in British electoral history.  He was re-elected with a narrow majority at the 1950 general election.  In the following year, Attlee called a snap general election, hoping to increase his parliamentary majority.  However, he was narrowly defeated by the Conservatives under the leadership of Winston Churchill; despite winning the most votes of any political party in any general election in British political history until the Conservative Party's fourth consecutive victory in 1992.  Attlee remains the longest-ever serving Leader of the Labour Party.

Supporting paragraphs: Portillo moment Stephen Twigg
Answer: Stephen Twigg