European Constitution referendum. More than 54% of the French citizens refused it, damaging Strauss-Kahn's position inside the PS, while left-wing Laurent Fabius, who had campaigned for a 'No' vote, was reinforced. Strauss-Kahn sought the nomination for the Socialist candidacy in the 2007 presidential election. His challengers were former prime minister Laurent Fabius and Ségolène Royal, the president of the Poitou-Charentes region. Strauss-Kahn finished second, behind Royal. On 13 April 2007, Strauss-Kahn called for an "anti-Sarkozy front" between the two rounds of the forthcoming presidential election. Following Ségolène Royal's defeat, Strauss-Kahn criticized the PS's strategy and its chairman, François Hollande. Along with Fabius, he then resigned from the party's national directorate in June 2007. Strauss-Kahn had been widely expected to seek the Socialist nomination for President of France in 2012, and was considered an early favorite. IMF Managing Director (2007–11) On 10 July 2007, Strauss-Kahn became the consensus European nominee to be the head of the IMF, with the personal support of President Nicolas Sarkozy (member of the right UMP party). Former Polish Prime Minister Marek Belka withdrew his candidacy as it was opposed by the majority of European countries. Some critics alleged that Sarkozy proposed Strauss-Kahn as managing director of the IMF to deprive the Socialist Party of one of its more popular figures. Strauss-Kahn became the front runner in the race to become Managing Director of the IMF, with the support of the 27-nation European Union, the United States, China and most of Africa. On 28 September 2007, the International Monetary Fund's 24 executive directors selected him as the new managing director. Strauss-Kahn replaced Spain's Rodrigo Rato. On 30 September 2007, Dominique Strauss-Kahn was formally named as the new head of the International Monetary Fund (IMF). The only other nominee was the Czech Josef Tošovský, a late candidate proposed by Russia. Strauss-Kahn said: "I am determined to pursue without delay the reforms needed for the IMF to make financial stability serve the international community, while fostering growth and employment". Under Strauss-Kahn the IMF's pursuit of financial stability included calls for a possible replacement of the dollar as the world's reserve currency. An IMF report from January 2011 called for a stronger role for special drawing rights (SDR) in order to stabilize the global financial system. According to the report, an expanded role for SDRs could help to stabilize the international monetary system. Furthermore, for most countries (except for those