Democratic Sen. Ben Cardin, who is up for reelection this year, began airing the second in a series of television advertisements Tuesday, this one focused on the economic impact of his efforts to restore the Chesapeake Bay.

The ad, titled “Oysternomics,” features the senator working on an oyster boat as a narrator explains that “by helping restore thousands of acres of oyster beds, he kept hundreds of oystermen on the job.” The narrator goes on to talk about the economic benefits of that impact.

“It’s like he’s out here with us,” the narrator says.

The ad is running in Baltimore and Montgomery County, according to the campaign. Cardin, for now, is considered a safe bet for reelection. He faces eight other Democrats in the April 3 primary.