Agroup of migrant farmworkers only employs one lobbyist, so it isn't able to convince many legislators to support its agenda. what possible disadvantage of interest groups does this scenario illustrate?

I believe the answer is: They lack power unless they are well funded

In lobbying, the more fund that a certain lobbyist group has, the larger their ability to increase the popularity of a certain candidate became.
Since lobbyist for farmworkers had low economic power, they wouldn't be able to support enough campaigns to help their candidate to win.

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