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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 Mason ReidDems search for winning playbook Dems face hard choice for State of the Union response The Memo: Immigration battle tests activists’ muscle 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 Forbes KerryFeehery: Oprah Dem presidential bid unlikely Dem hopefuls flock to Iowa Change in Iran will only come from its people — not the United States 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 Sidney McCainMcCain rips Trump for attacks on press NSA spying program overcomes key Senate hurdle Meghan McCain says her father regrets opposition to MLK Day MORE (R-Ariz.) campaigned for Gomez and first lady Michelle ObamaMichelle LeVaughn Robinson ObamaCriticism of Melania Trump shows a lot about the #MeToo movement Obama tells Letterman of showing off his 'dad moves' in front of Prince Smithsonian to unveil Obamas' portraits next month MORE attended a recent fundraiser for Markey.