David William Donald Cameron, (; born 9 October 1966), is a British politician who is at present the Prime Minister of the United Kingdom, Leader of its Conservative Party, and Member of Parliament for the Oxfordshire constituency of Witney. In 2005, he won the Conservative Party leadership election. Following the election of a hung parliament in the 2010 general election, Cameron became Prime Minister as the leader of a coalition between the Conservatives and Liberal Democrats. He was re-elected Prime Minister in the 2015 election, when his party won a parliamentary majority for the first time since 1992. He was first elected to the Parliament of the United Kingdom in 2001. His premiership has been marked by the ongoing effects of the late-2000s financial crisis leading to a large deficit in government finances, which his government has emphasised the need to reduce through austerity measures. Cameron’s administration introduced large-scale changes to welfare, immigration policy, education and healthcare, by introducing the Welfare Reform Act of 2012, the Education Act of 2011, the Health and Social Care Act of 2012 and a range of immigration reforms from 2010 onwards, culminating in the Immigration Act of 2014. In 2011, Cameron became the first UK Prime Minister to ‚veto’ a European Union treaty. Cameron’s government introduced a nationwide referendum on voting reform in 2011, and agreed to a Scottish independence referendum in September 2014, which resulted in a ‚No’ to independence majority. David Cameron is the first Conservative Party leader to set out the case for same-sex marriage in the Marriage (Same Sex Couples) Act 2013. Cameron’s government met the United Nations target of spending at least 0.7% of GNI on aid to developing countries. In 2013, Cameron promised an ‚In/Out’ referendum on the UK’s membership of the EU before the end of 2017, which would follow a period of renegotiation with the EU. The referendum is to occur on 23 June 2016.