Dill was the 2012 Democratic nominee to replace outgoing Senator Olympia Snowe and represent Maine in the United States Senate, but came in third in the general election behind former Independent governor Angus King and Republican Secretary of State Charlie Summers.

In January 2012, Dill announced that she would seek the Democratic Party’s nomination for the U.S. Senate then held by incumbent Republican U.S. Senator Olympia Snowe.

Dill won a four-way Democratic Senate Primary on June 12, 2012. She faced Republican Charlie Summers, independent candidates Angus King and Danny Dalton as well as Libertarian Party-affiliated independent Andrew Ian Dodge in the November election.

Following the resignation of State Senator Larry Bliss in 2011, Dill won a special election to replace Bliss, defeating former Republican State Representative Louie Maietta 68%-32%.

Dill is a strong supporter of same-sex marriage. In November 2011, Dill formed a group, “The Friends of the Maine Woods”, to support Roxanne Quimby’s bid to donate land to create a national park in the Millinocket region of Maine. The town council of Millinocket and the Maine State Legislature passed resolutions opposing the creation of the proposed national park.

Dill was first elected to the Maine House of Representatives in 2006 to represent Maine’s 121st House District, based in Cape Elizabeth. She defeated Republican nominee Jennifer Duddy 52%-48%. In 2008, she won re-election to a second term with 61% of the vote. In 2010, she won re-election to a third term with 58% of the vote.

Cynthia Dill (born January 6, 1965) is an American lawyer and politician from Maine. A member of the Democratic Party, she served in the Maine House of Representatives and Maine Senate, representing the 7th district which is composed of South Portland, her hometown of Cape Elizabeth, and a small portion of Scarborough.