This is what the extreme Right did. The Moral Majority would show up at every local GOP meeting. If the local club usually had twenty people at the meeting, the MMs would show up with fifty. Picking the candidate for dog catcher or justice of the peace? The MM were there and they made sure they got their candidate in.
Nixon did something similar. After he failed to win the Senate seat he hit the road and campaigned hard for every GOP he could find. By 1968 he had dozens of delegates to the national convention in his pocket.