Final answer:
Barack Obama was re-elected in 2012 due to his effective use of social media, his promises of 'hope and change,' and his support from key demographics.
Step-by-step explanation:
In 2012, Barack Obama was re-elected as President of the United States. His re-election can be attributed to several factors, including his ability to harness social media and connect with voters, his promises of 'hope and change,' and his support from key demographics such as African Americans and first-time voters.