Final answer:
Volunteers are critical to the success of political campaigns and can significantly increase a candidate's supporters. Therefore, the given statement is True.
Step-by-step explanation:
True. Volunteers are critical to the success of political campaigns and can help double, triple, or even quadruple a candidate's supporters. They play a vital role in grassroots efforts such as canvassing neighborhoods, putting up signs, making phone calls, distributing campaign materials, and organizing events. Their contributions help in reaching out to potential supporters and persuading undecided voters.