Cristina Fernández de Kirchner of the Buenos Aires province, both leaders had their respective wives run for the office: Hilda González de Duhalde for the PJ, and Cristina Kirchner for the Front for Victory. Cristina Kirchner won the election. The presidential election was held on 28 October 2007. With Kirchner leading all the pre-election polls by a wide margin, her challengers focused on forcing her into a ballotage. To win in a single round, a presidential candidate in Argentina needs either more than 45% of the vote, or 40% of the vote and a lead of more than 10 percentage points over the runner-up.
Presidency of Cristina Fernández de Kirchner In March 2008, Kirchner introduced a new sliding-scale taxation system for agricultural exports, effectively raising levies on soybean exports from 35% to 44% at the time of the announcement. This led to a nationwide lockout by farming associations, starting on March 12, with the aim of forcing the government to back down on the new taxation scheme. They were joined on March 25 by thousands of pot-banging demonstrators massed around the Buenos Aires Obelisk and in front of the presidential palace. Protests extended across the country. In Buenos Aires, hours after Kirchner attacked farmers for their two-week strike and "abundant"