As PRI won the midterm parliamentary election in 2009，Calderon has to square up to the challenge of how to get PRI’s support in the Congress during the second half of his term. Mexico’s economy is in deep recession due to the impacts of global financial crisis，putting the government in the dilemma of balancing its efforts of boosting consumers and investors’ confidence and preventing fiscal deficits and inflation. Security cooperation and joint efforts to counter the financial crisis topped the US-Mexico diplomatic agenda during Obama’s presidency，meanwhile trade protectionism under the circumstances of financial crisis undermined bilateral ties. Economic recession was translated into high unemployment，increasing poverty and other social problems while public security and drug enforcement remain arduous tasks for the country to handle. Besides，the outbreak of H1N1 in 2009 channels new pressures on Calderon’s government from both within the country and abroad.