Question: When William Gladstone successfully relaunched his political career in Scotland in advance of the 1880 General Election, which party did he lead?

Passages:
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. William Ewart Gladstone, ( ; 29 December 1809 – 19 May 1898) was a British Liberal statesman and earlier Conservative politician.  In a career lasting over 60 years, he served as Prime Minister four separate times (1868–74, 1880–85, February–July 1886 and 1892–94), more than any other person, and served as Chancellor of the Exchequer four times.  Gladstone was also Britain's oldest Prime Minister; he resigned for the final time when he was 84 years old. The Midlothian campaign of 1878–80 was a series of foreign policy speeches given by William Ewart Gladstone, leader of Britain's Liberal Party.  It is often cited as the first modern political campaign.  It also set the stage for Gladstone's comeback as a politician.  It takes its name from the Midlothian constituency in Scotland where Gladstone (of Scottish ancestry) successfully stood in the 1880 election. Benjamin Disraeli was appointed Prime Minister of the United Kingdom for a second time by Queen Victoria after William Ewart Gladstone's government was defeated in the 1874 general election.  Disraeli's foreign policy was seen as immoral by Gladstone, and following the latter's Midlothian campaign, the government was heavily defeated in the 1880 general election, whereupon Gladstone formed his second government.  The ailing Disraeli, by now created Earl of Beaconsfield, died in April 1881. After campaigning against the foreign policy of the Beaconsfield ministry, William Gladstone led the Liberal Party to victory in the 1880 general election.  The nominal leader of the Party, Lord Hartington, resigned in Gladstone's favour and Gladstone was appointed Prime Minister of the United Kingdom for a second time by Queen Victoria.  He pursued a policy of parliamentary reform, but his government became wildly unpopular after the murder of General Gordon in 1885.  Gladstone was held responsible, and resigned, leaving the way free for the Conservatives under Lord Salisbury to form a government. The 1874 United Kingdom general election saw the incumbent Liberals, led by William Ewart Gladstone, lose decisively, even though it won a majority of the votes cast.  Benjamin Disraeli's Conservatives won the majority of seats in the House of Commons, largely because they won a number of uncontested seats.  It was the first Conservative victory in a General Election since 1841.  Gladstone's decision to call an election surprised his colleagues, for they were aware of large sectors of discontent in their coalition.  For example, the nonconformists were upset with education policies; many working-class people disliked the new trade union laws and the restrictions on drinking.  The Conservatives were making gains in the middle-class, Gladstone wanted to abolish the income tax, but failed to carry his own cabinet.  The result was a disaster for the Liberals, who went from 387 MPs to only 251.  Conservatives jumped from 271 to 342.  For the first time the Irish Nationalists gained seats, returning 59.  Gladstone himself noted, "We have been swept away in a torrent of gin and beer." Reverend John Kinnear (1824–1894) was an Irish politician and Presbyterian minister.  He was elected to the United Kingdom House of Commons as Member of Parliament (MP) for Donegal at the 1880 general election, and held the seat until the constituency was divided for the 1885 general election. John Daly (1834 – 24 February 1896) was an Irish Nationalist politician.  He was elected to the United Kingdom House of Commons as a Home Rule League Member of Parliament (MP) for Cork City at the 1880 general election, and joined the new Irish Parliamentary Party in 1882.  He resigned his seat on 11 February 1884. The 1880 general election in Ireland marked the beginning both of the dominance of the Irish Parliamentary Party in Irish politics and of Charles Stewart Parnell's dominance within the Party. David Ainsworth (1842 – 21 Mar 1906) was a British Liberal Party politician.  He first elected a Member of Parliament (MP) for the West Division of Cumberland at the 1880 general election.  He had run unsuccessfully for this position in 1874.  In 1885 and 1886 he ran for the Egremont constituency in Parliament, but lost.  He however won the election to this constituency in 1892, but held the seat for only three years, being defeated at the 1895 general election.

Supporting sentences:
The Midlothian campaign of 1878–80 was a series of foreign policy speeches given by William Ewart Gladstone, leader of Britain's Liberal Party. William Ewart Gladstone, ( ; 29 December 1809 – 19 May 1898) was a British Liberal statesman and earlier Conservative politician.  In a career lasting over 60 years, he served as Prime Minister four separate times (1868–74, 1880–85, February–July 1886 and 1892–94), more than any other person, and served as Chancellor of the Exchequer four times.