President Obama ran for re-election in 2012. His main opponent was a Republican business executive and former governor of Massachusetts named Mitt Romney. There were also third-party candidates such as Libertarian Gary Johnson on the ballot, but the majority of the votes were divided between Mr. Obama and Mr. Romney.
In the 2008 election, Mr. Obama first ran against Hillary Clinton to get the Democratic party's nomination for president. He then ran against the Republican party's nominee, John McCain, and defeated him.
Senator John McCain ran against Barack Obama for what became Obama's second term.
In 2008, Barack Obama won the Democratic nomination by defeating Hillary Clinton. He then went up against the Republican nominee, Senator John McCain of Arizona. Mr. Obama won that election and became president. In 2012, he ran for re-election. His Republican opponent was former Massachusetts governor Mitt Romney; and again, Mr. Obama was the winner.
Senator John McCain ran against Barack Obama for what became Obama's second term.
John McCain
After losing the Democratic Primary nomination for President to Barack Obama, Hillary Rodham Clinton later became Obama's Secretary of State. Clinton at the time was the former First Lady, and the US Senator from New York.
Alton B. Parker was the Democratic Party Presidential Nominee who ran against Theodore Roosevelt in 1904, and John W. Davis was the Democratic Nominee who ran against Calvin Coolidge in 1924.
Obama's main opponent was Hillary Clinton, the senator from New York.
John Kerry was the Democratic candidate against Bush in 2004.
Since his first time running for office in 1996, Mr. Obama ran as a Democrat. He was always a member of the Democratic party, throughout his political career.
No one, because 2007 wasn't an election year.
William Taft ran against William Jennings Bryan, who was a member of the Democratic Party.William Bryan