David Calone, who is challenging Anna Throne-Holst in a primary...

David Calone, who is challenging Anna Throne-Holst in a primary for the chance to run against Repubican Rep. Lee Zeldin in the First Congressional District, has launched a television ad attacking Throne-Holst's tenure as a Democrat. Credit: Barry Sloan

Congressional candidate and venture capitalist David Calone launched his first TV campaign ad on Tuesday, a spot that attempts to highlight his Democratic primary opponent Anna Throne-Holst’s brief tenure in the party.

The ad says “there’s only one Democrat” who’s prosecuted corporate corruption, protected the environment and is “endorsed by Democrats in every part of Suffolk County.”

Calone faces former Southampton Supervisor Anna Throne-Holst, who was a registered Independence Party member until May 2015, when she registered as a Democrat to run for Congress.

The ad, which doesn’t mention Throne-Holst, says Calone has “progressive values” and would fight for clean water, a higher minimum wage and less money in politics.

Calone, a former Suffolk Planning Commission member, and Throne-Holst are vying for the Democratic nomination to challenge first-term Rep. Lee Zeldin (R-Shirley) in the June 28 primary.

Throne-Holst spokesman Andrew Grunwald said, “Anna is the only Democrat in the race elected in the district who has delivered on her agenda” of turning around Southampton and advancing environmental programs there.

The $95,000 cable ad buy started Tuesday morning. Calone spokesman Rahul Kale said the campaign would be on TV for the remainder of the campaign.