WASHINGTON – Vice President Joe Biden is planning to headline a fundraiser next week for Representative Edward J. Markey, as Democrats continue to try and inject funds into his US Senate campaign in the final stretch of the Massachusetts special election.

Former Vice President Al Gore and Vicki Kennedy, the widow of Senator Edward M. Kennedy, are also both planning to attend the fundraiser in Washington on Tuesday evening.

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About 150 people are expected at the fundraiser, which will raise money for both Markey and the Massachusetts Democratic Party, according to the Markey campaign.

Markey, who has been mocked by his Republican opponent Gabriel Gomez for his close ties to the Washington establishment, will not be at his own fundraiser. He will instead be in Springfield that night, debating Gomez for the second time.

The fundraiser is being held the night before President Obama travels up to Boston for a fundraiser for Markey, which comes several weeks after First Lady Michelle Obama did the same.

Markey on Friday scrapped plans to attend a fundraiser on Sunday at the Beverly Hills home of entertainment magnate Haim Saban and his wife, Cheryl. He had been facing criticism for choosing to leave for the West Coast to raise money so close to the June 25 special election.

The fundraiser on Tuesday night will not be the first time Markey and Gore—two politicians passionate about technology and the environment—have been linked. Republicans mocked Markey when he touted a bill that he co-authored, the 1996 Telecommunications Act, and said it helped lay the groundwork for future technology companies like Google, Facebook, and YouTube to succeed.

Republicans have said Markey’s remark was akin to Gore’s onetime claim that he “took the initiative in creating the Internet.”

Several prominent Republicans have sent out fundraising appeals to help Gomez – among them Senator Marco Rubio, of Florida, and Senate Minority Leader Mitch McConnell – but Gomez has largely been running against Washington and has tried to distance himself from national Republicans.