Question

why are grassroots volunteers necessary for presidential campaigns? grassroots volunteers vote at conventions. presidential campaigns are huge and expensive. grassroots volunteers are a legal requirement.

Explanation:

Presidential campaigns operate on large scales with high costs, and grassroots volunteers provide free labor for tasks like canvassing, phone banking, and event support, reducing financial burdens. Delegates (not typical grassroots volunteers) vote at conventions, and there is no legal mandate requiring grassroots volunteers for these campaigns.

Answer:

Presidential campaigns are huge and expensive.