Supporters of Argentina's President Cristina Fernandez de Kirchner, trade unions and social groups gather in front of the presidential palace in a planned rally to back the Argentine leader in Buenos Aires April 1, 2008. Tens of thousands of Argentines rallied in support of president Fernandez on Tuesday as she confronted a 20-day farm strike that has provoked food shortages and a political crisis. Columns of union members, community groups and human rights activists allied with Fernandez marched on the presidential palace in downtown Buenos Aires as farmers maintained roadblocks nationwide to protest a tax hike on soy exports. REUTERS/Marcos Brindicci (ARGENTINA)