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The presidency of Barack Obama began at noon EST on January 20, 2009, when Barack Obama became the 44th President of the United States. Obama, a Democrat, was a United States Senator from Illinois at the time of his victory over Republican Senator John McCain of Arizona in the 2008 presidential election. Obama is the first African American president, the first multiracial president, the first non-white president, and the first president to have been born in Hawaii. Obama's running mate, Senator Joe Biden of Delaware, also took office as Vice President on January 20, 2009.

The presidency of Barack Obama began at noon EST on January 20, 2009, when Barack Obama became the 44th President of the United States. Obama, a Democrat, was a United States Senator from Illinois at the time of his victory over Republican Senator John McCain of Arizona in the 2008 presidential election. Obama is the first African American president, the first multiracial president, the first non-white president, and the first president to have been born in Hawaii. Obama's running mate, Senator Joe Biden of Delaware, also took office as Vice President on January 20, 2009.

Obama's first-term actions addressed the global financial crisis and included a major stimulus package, a partial extension of the Bush tax cuts, legislation to reform health care, a major financial regulation reform bill, and the end of a major US military presence in Iraq. Obama also appointed Supreme Court Justices Elena Kagan and Sonia Sotomayor, the latter of whom became the first Hispanic American on the Supreme Court. Democrats controlled both houses of Congress until Republicans won a majority in the House of Representatives in the 2010 elections. Following the elections, Obama and Congressional Republicans engaged in a protracted stand-off over government spending levels and the debt ceiling.

Obama won election to a second term in 2012, making him the seventeenth person to win two presidential elections. In his second term, Obama took steps to combat climate change, signing a major international climate agreement and an executive order to limit carbon emissions. Obama also presided over the implementation of the Affordable Care Act and other legislation passed in his first term, and he negotiated rapprochements with Iran and Cuba. The number of American soldiers in Afghanistan fell dramatically during Obama's second term, though the United States currently plans to leave soldiers in Afghanistan until at least 2017. Republicans took control of the Senate after the 2014 elections, and Obama continued to grapple with Congressional Republicans over government spending, immigration, judicial nominations, and other issues. Obama's presidency is scheduled to end with the inauguration of Republican President-elect Donald Trump on January 20, 2017.