On November 4, 2008, Barack Obama was elected to become the 44th president of the United States. The Democratic senator from Illinois made history as the first black candidate to win the presidency, and his election attracted massive attention worldwide. Obama inherited a daunting set of challenges from his predecessor, President George W. Bush: the worst economy in decades, wars in Iraq and Afghanistan, and an international image of the United States that had been marred by the policies of the "war on terror." Here are images of some of most important moments of Obama's presidency.