What advantage does having a large party membership offer during campaigning?

Having a large party membership significantly enhances campaign efforts primarily through increased volunteer support. A greater number of members can mobilize to assist with various campaign activities such as canvassing, phone banking, and organizing events, which are crucial for reaching and engaging with voters. The presence of committed volunteers can help amplify the party's message, gather grassroots support, and create a sense of community and excitement around the campaign.

Additionally, while it's possible that a large membership may lend some degree of influence in an election, it does not guarantee an automatic win or reduce the need for political broadcasting. Control over other parties' campaigns is not a feasible advantage of large membership; instead, effective campaigning typically focuses on strengthening one's own support base.