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In the email, Rubio writes that a victory for Gomez would be a "huge step" toward replacing Senate Majority Leader Harry ReidHarry ReidWarren cautions Dems against infighting Dems see surge of new candidates Dems to grind Senate to a halt over ObamaCare repeal fight MORE (D-Nev.) with a Republican majority leader.

"Gomez is a business leader and a former Navy Seal who knows what it means to fight for our freedoms. Now he's fought within inches of a major political upset that could have national implications — which is why liberals have pulled out all the stops," Rubio writes in the fundraising email from Reclaim America PAC. "Gomez is currently facing a massive onslaught of Democratic special interest money. Everyone from President Obama to Harry Reid to a host of Hollywood liberals have pitched in to help defeat Gomez. Now it's time to come to his aid."

The email comes just three weeks ahead of the special election for Secretary of State John KerryJohn KerryFrustrated Dems say Obama botched Russia response Budowsky: Dems madder than hell Tillerson: 'My view didn’t change' on Paris climate agreement MORE's former Senate seat.

Republicans in Massachusetts are reportedly spending $400,000 on ad spending in support of Gomez.

High profile political figures have also campaigned on behalf of Markey and Gomez, respectively. Sen. John McCainJohn McCainFrustrated Dems say Obama botched Russia response Coats: Trump seemed obsessed with Russia probe The Hill's Whip List: Senate ObamaCare repeal bill MORE (R-Ariz.) campaigned for Gomez and first lady Michelle ObamaMichelle ObamaMichelle Obama holds fitness 'bootcamps' for friends Obama marks Father’s Day: ‘I'm most proud to be Sasha and Malia's dad’ Obamas invited to be honorary football coach at University of Michigan MORE attended a recent fundraiser for Markey.