Falmouth Democrat Rep. Dylan Fernandes said Tuesday he raised a whopping $83,664 in December, the first month of his campaign for a South Shore and Cape Cod Senate seat where the incumbent is not running for reelection.

Fernandes said he received the cash from 350 donors in four weeks after he announced his bid for the Plymouth and Barnstable District, which Sen. Susan Moran, a Democrat, said she will not seek reelection to as she pursues an elected county post.

Fernandes said he is “deeply humbled” by the support he received.

“It shows early support for our campaign to bring new energy and experienced leadership to make our communities a more affordable and vibrant place to live,” he said in a statement.

Details of Fernandes’ December fundraising haul were not immediately available on the state’s campaign finance website.

The fourth-term state representative drew the endorsement of Gov. Maura Healey last month, who touted Fernandes as a politician focused on affordable housing, job creation, and infrastructure needs.

At least one Republican, Bourne School Committee member Kari MacRae, has officially jumped into the race. MacRae’s December fundraising numbers were not immediately available on the state’s campaign finance website.

MacRae told the Herald she raised just over $1,500 in December.

Plymouth Republican Rep. Mathew Muratore, a fifth term state lawmaker, is still debating jumping into the race.