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AUGUSTA, Maine (AP) -- The four candidates hoping to fill Maine's open 2nd Congressional District seat are making last-minute appeals to voters.

Liberal dealmaker Emily Cain and working-class advocate Troy Jackson square off in Tuesday's Democratic primary. On the GOP side, establishment Republican Kevin Raye is taking on tea-party favorite Bruce Poliquin (PAHL'-eh-kwihn).

Secretary of State Matt Dunlap said he's seeing light turnout, as expected. The 1st Congressional District, Senate and governor primary races are all uncontested

In the 2nd District, both primaries pit candidates who pledge to be fighters in Washington against those who vow to break down political barriers.

Jackson and Poliquin have accused their foes of being too willing to compromise their party's values, while Cain and Raye say their opponents' "my-way-or-the-highway" approach won't work.

(Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

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