Why did Barack Obama win the 2012 US presidential election over Mitt Romney?

It's a matter of opinion, which makes it difficult to answer this sort of question. Supporters of the president would say he cares about average and working people, while Mitt Romney only cares about the super-wealthy. Supporters would also say that Mr. Obama wants to keep jobs in America, while Mitt Romney has a history of sending jobs to third-world countries. Also, many people believe the Republican party has moved so far to the right that it opposes women's access to contraception, opposes equal rights for gay Americans, and believes that all undocumented immigrants, even children who have lived here all their life, should be deported with no chance to ever become citizens. So, although some Americans do believe the country needs a change, they do not believe Mitt Romney would be the best candidate. Still, Mr. Romney has many supporters, and although he lost the election (this question was first asked before the election was held), 47% of Americans voted for him.