正当美国面临两场战争和一场危机的艰难时刻，政治新人奥巴马高举“变革”的旗帜成功当选第44任美国总统。就任两年多来，奥巴马秉承“新政”的理念，对美国的内政外交进行了一场自冷战结束以来最为深刻的调整。在经济和社会政策上，他将反危机措施与纠正“市场至上”的偏颇结合在一起，推出了美国历史上最大规模的政府刺激计划、最严格的金融监管法案和最大规模的医疗保险改革行动。在政治上，他试图消解“极化”现象，提倡两党共治、“合众而一”。在对外关系上，他推崇“巧实力”外交，着力改善美国的形象，力图重塑美国“领导地位”。尽管奥巴马推行“变革”不遗余力，但成效有限。为此，他也在中期选举中遭遇重大挫折。在未来的任期中，他的施政中心可能已不再是“变革”，而是在2012年总统大选中争取连任。
At the critical moment of the United States facing a financial crisis and two wars，Barack Obama was elected 44th President with mandate for change.Since taking office，President Obama，with idea of the New Deal，has set to adjust U.S.domestic and foreign policy extensively and significantly.In economic and social area，he proposed the biggest stimulus plan，the strictest financial regulatory reform legislation，and the most comprehensive health care reform in American history.In political area，he advocates “Out of many，one” to dispel political polarization in the American public.In foreign relations area，he tries to use “smart power” to renew American leadership in the world.Although he tried to do his best to push his reform，the effect of “change” is quite limited.As a result，he and his party lost the mid-term election at the end of last year.Therefore，he has to adjust his priority to make sure reelected in 2012 general election.
