(CNN) - Republican Linda McMahon will face Democrat Rep. Chris Murphy in the November election in Connecticut to fill the U.S. Senate seat being vacated by Sen. Joseph Lieberman.
McMahon won her state's Republican nomination on Tuesday after her primary opponent, Chris Shays, conceded. On the Democratic side, Murphy defeated Secretary of State Susan Bysiewicz.
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The two entered this primary after McMahon, a former wrestling executive, won 60% of the vote at the state GOP convention in May, while Shays won 32% - crossing the 15% threshold to force a statewide primary.
Murphy is a third term representative whose district includes Western Connecticut and who previously held state-level offices.
A June poll found showed Murphy with three point advantage over McMahon in a head-to-head matchup, though the difference was within the poll's sampling error of plus or minus 2.6 percentage points. Both candidates held approximately 30-point leads over their intra-party opponents at that point.
Lieberman is retiring after four terms in the Senate. He faced a challenging primary of his own in 2006, when he lost the Democratic primary and ran - successfully - for reelection as an independent.
Lieberman's retirement comes two years after Sen. Chris Dodd, D-Connecticut, retired in 2010 following the disclosure of the preferential mortgage rate he received. McMahon campaigned for the seat but lost.
- CNN's Ashley Killough and Kevin Liptak contributed to this report