NASHVILLE - Early voting ends Wednesday in a critical Tennessee special election to fill a vacant U.S. House seat long held by Republicans but where both parties are competing heavily in the hope of gaining momentum for next year's mid-term elections.

Retired GOP Rep. Mark Green announced his resignation on June 9 and officially stepped down in July. Republican nominee Matt Van Epps and Democratic nominee Aftyn Behn will face off in the general election to fill the congressional seat.

Ahead of Election Day on Dec. 2, a new Emerson College Polling/The Hill survey shows how Tennessee voters are leaning.

More: Trump-backed GOP candidate Matt Van Epps wins primary for Tennessee special election

The poll found Van Epps with 48% support and Behn with 46%. Two percent back one of three third-party candidates, while 5% remain undecided. When undecided voters are asked which way they lean, Van Epps’ support rises to 49% and Behn’s to 47%.