Tony Blair won a general election.
Tony Blair . He remains the most recent Labour Party leader to have won a general election . Supporters , including the party 's public opinion pollster Philip Gould , stated that after four consecutive general election defeats , from 1979 to 1992 , the Labour Party had to demonstrate that it had made a decisive break from its left-wing past , in order to win an election again . In May 1997 , the Labour Party won a landslide general election victory , the largest in its history , allowing Blair , at 43 years old , to become the youngest Prime Minister since 1812 .