Barack Hussein Obama II (; born August 4 1961) is the junior United States Senator from Illinois. He is the presumptive nominee of the Democratic Party in the 2008 presidential election, and the first African American to be a major party's presumptive nominee for President of the United States.

A graduate of Columbia University and Harvard Law School, Obama worked as a community organizer and practiced as a civil rights attorney before serving in the Illinois Senate from 1997 to 2004. He also taught constitutional law at the University of Chicago Law School from 1992 to 2004. Following an unsuccessful bid for a seat in the U.S. House of Representatives in 2000, he announced his campaign for the U.S. Senate in January 2003. After winning a landslide primary victory in March 2004, Obama delivered the keynote address at the Democratic National Convention in July 2004. He was elected to the Senate in November 2004 with 70% of the vote.

As a member of the Democratic minority in the 109th Congress, he cosponsored legislation to control conventional weapons and to promote greater public accountability in the use of federal funds. He also made official trips to Eastern Europe, the Middle East, and Africa. In the current 110th Congress, he has sponsored legislation regarding lobbying and electoral fraud, climate change, nuclear terrorism, and care for returned U.S. military personnel. Since announcing his presidential campaign in February 2007, Obama has emphasized withdrawing American troops from Iraq, increasing energy independence, decreasing the influence of lobbyists, and promoting universal health care as top national priorities.