Former President Barack Obama gave his nominee acceptance speech.
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President Barack Obama announced his Clean Power Plan to take action on climate change.
Transgender people were no longer allowed to use public toilets after Obama's rule was rebuked by Donald Trump.
Obama surprised Biden with the Presidential Medal of Freedom during a White House ceremony.
The 'Don't Ask Don't Tell' policy was repealed.
Barack Obama became the first African American to win a United States Presidential Election.
