Senator Barack Obama (D-IL) wins the 2008 election for US president. He replaces President George W. Bush, a Republican. Obama becomes the first African-American president in the history of the US. He defeats Senator John McCain (R-AZ) by a 52 percent to 46 percent margin in the national popular vote, and by a 365-173 margin in the electoral vote. The Democratic Party also increases its lead in the Senate, with a 56-41 margin, and a 255-175 margin in the House of Representatives. Finally, Democrats gain a +1 margin in the nation’s 11 gubernatorial elections. [National Public Radio, 11/2008; United Press International, 11/5/2008] Obama will begin his four year term as president on January 20, 2009, after a transition period (see January 20-21, 2009).