 However, on February 28, 2012, Snowe announced that she would be retiring from the U.S. Senate at the end of her term, citing the "atmosphere of polarization and 'my way or the highway' ideologies has become pervasive in campaigns and in our governing institutions" as the reason for her retirement.Her announcement opened the door for candidates from all parties and creating a much more contested 2012 election.The primary election was held June 12.