The Liberal Democrats are a party with policies on constitutional and political reforms, including changing the voting system for general elections (2011 United Kingdom Alternative Vote referendum), abolishing the House of Lords and replacing it with a 300-member elected Senate, introducing fixed five-year Parliaments, and introducing a National Register of Lobbyists. They also support what they see as greater fairness and social mobility. In the coalition government, the party promoted legislation introducing a pupil premium - funding for schools directed at the poorest students to give them an equal chance in life. They also supported same-sex marriage and increasing the income tax threshold to £10,000, a pre-election manifesto commitment.