A Democratic super-PAC announced on Thursday that it will be launching a $1 million ad campaign to support Rep. Patrick Murphy’s senate bid in Florida.

ADVERTISEMENT

The Senate Majority PAC, which is run by allies of Minority Leader Harry Reid Harry Mason ReidDemocrats fear Russia interference could spoil bid to retake Senate Graham signals support for confirming a Supreme Court nominee this year Trump signals he will move to replace Ginsburg 'without delay' MORE (D-Nev.), will release the cable and broadcast television ads next week.

Murphy is considered the favorite over Rep. Alan Grayson Alan Mark GraysonFlorida's Darren Soto fends off Dem challenge from Alan Grayson Live results: Arizona and Florida hold primaries The Hill's Morning Report: Frustration mounts as Republicans blow up tax message MORE to win the Democratic primary and face the incumbent, Sen. Marco Rubio Marco Antonio RubioSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE.

Rubio is heavily favored in Florida's Republican primary, where he faces real estate developer Carlos Beruff.

“Marco Rubio and his allies have always struggled with the truth and their recent attacks are no exception,” Shripal Shah, a spokesman for the group, said in a statement.

“We’re not going to let them get away with misleading voters just to help Marco Rubio further his 2020 presidential ambitions. Floridians deserve better, starting with a Senator who actually wants the job and will show up to work.”

Rubio announced last month that he was running for reelection, reversing a pledge he had made during his failed presidential bid not to seek to retain his seat.

The Reid-linked group backing Murphy comes as little surprise following a high-profile spat between the minority leader and Grayson.

Reid had called on Grayson to resign over an ethics probe into the congressman’s hedge fund. In May, Grayson confronted Reid during a closed-door meeting of Congressional Progressive Caucus lawmakers, saying that the ethics allegations were untrue.

“It is true, and I want you to lose,” Reid responded.