Assuming the local/regional party machine backs him and provides campaign funds, he'll likely be required to at least call some major donors soliciting support for other campaigns that the relevant leadership is interested in or for the party organization itself. Congressmen at the state and federal level spend an absurd amount of time doing these calls on behalf of their own and others' campaigns because those elections are expensive to fight but at the local level, the elections are far cheaper and the allegiances to parties are looser. He would have to cater to his supporters in order to get their support for the next election but he wouldn't be obligated to do anything.