- 
  
  President Barack Obama files the necessary paperwork with Federal Election Committee for a hopes of a re-election
- 
  
  
- 
  
  Former Massachusetts Governor Mitt Romney officially declares his candidacy for presidential nomination of the Republican Party.
- 
  
  Former U.S. Senator Rick Santorum officially declares his candidacy for presidential nomination of the Republican party.
- 
  
  Rick Santorum wins a narrow victory over Mitt Romney in the Iowa Republican Caucuses.
- 
  
  Mitt Romney wins the New Hampshire Republican Primary
- 
  
  Rick Santorum wins the Minnesota Republican Caucuses, the Colorado Republican Caucuses and the Missouri Republican Primary.
- 
  
  Mitt Romney wins the Connecticut, Delaware, New York, Pennsylvania and Rhode Island Republican Primaries.
- 
  
  Mitt Romney and Paul Ryan are officially nominated for President and Vice-President of the United States by the Republican National Convention.
- 
  
  Barack Obama and Joe Biden are officially nominated for President and Vice-President of the United States by the Democratic National Convention.
- 
  
  Election Day - President Barack Obama is re-elected to a second term.
- 
  
  The Electoral College formally elects President Obama and Vice President Biden.