German party on 10 April 2000. Her election surprised many observers, as her personality offered a contrast to the party she had been elected to lead; Merkel is a centrist Protestant originating from predominantly Protestant northern Germany, while the CDU is a male-dominated, socially conservative party with strongholds in western and southern Germany, and its Bavarian sister party, the CSU, has deep Catholic roots. Following Merkel's election as CDU Leader, the CDU was not able to win in subsequent state elections. As early as February 2001 her rival Friedrich Merz had made clear he intended to become Chancellor Gerhard Schröder's main challenger in the 2002 election. Merkel's own ambition to become Chancellor was well-known, but she lacked the support of most Minister-presidents and other grandees within her own party. She was subsequently outmaneuvered politically by CSU Leader Edmund Stoiber, to whom she eventually ceded the privilege of challenging Schröder. He went on to squander a large lead in opinion polls to lose the election by a razor-thin margin in an election campaign that was dominated by the Iraq War. While Chancellor Schröder made clear he would not join the war in Iraq, Merkel and the CDU-CSU supported the invasion of Iraq. Leader of the Opposition, 2002–2005 Some successes After Stoiber's defeat in 2002, in addition to her role as CDU Leader, Merkel became Leader of the Opposition in the Bundestag; Friedrich Merz, who had held the post prior to the 2002 election, was eased out to make way for Merkel. Stoiber voted for Merkel. Merkel supported a substantial reform agenda for Germany's economic and social system, and was considered more pro-market than her own party (the CDU). She advocated German labour law changes, specifically removing barriers to laying off employees and increasing the allowed number of work hours in a week. She argued that existing laws made the country less competitive, because companies could not easily control labour costs when business is slow. Merkel argued that Germany should phase out nuclear power less quickly than the Schröder administration had planned. Merkel advocated a strong transatlantic partnership and German-American friendship. In the spring of 2003, defying strong public opposition, Merkel came out in favour of the 2003 invasion of Iraq, describing it as "unavoidable" and accusing Chancellor Gerhard Schröder of anti-Americanism. She criticised the government's support for the accession of Turkey to the European Union and favoured a "privileged partnership" instead.