President Barack Obama | Barack Obama Presidential Library
10 Things You Didn't Know About Barack Obama
The politics of Barack Obama and his ascent to the presidency | Britannica
Barack Obama 'wanted to join US military'
Obama slams state of US politics in 1st post-presidency campaign stops, calls for rejection of Charlottesville hate - ABC News
Barack Obama | The White House
Who is the richest living American president? Net worths, ranked: from Donald Trump's real estate fortune to Bill Clinton and Barack Obama's book deal millions, but how about 'middle class Joe' Biden?
Did Barack Obama Serve Too Early? | Washington Monthly
Barack Obama: What He Achieved in the White House | Time
Barack Obama legacy: Did he improve US race relations? - BBC News
Barack Obama | whitehouse.gov
Why did Obama wait so long to allow transgender to serve in military?
Obama signs national service legislation - CNN.com
The politics of Barack Obama and his ascent to the presidency | Britannica
President Obama and Colbert Duke It Out | GW Today | The George Washington University
Why former president Obama picked Joe Biden as his VP: 'We couldn't have been more different'