According to Olson, large groups become latent and suffer from the free rider problem and as the group increases, there is a reduced chance of provision of the public good or group objective. He does give an exception to this rule, however. If a large group can become well organized through an alternative motivation to why they are organized, they are able to lobby and be productive as a by-product.
This was illustrated in Massachusetts when the entire voter population voted on the issue of abolishing the state income tax. When the large, unorganized group of voters took on the issue, only $5000 dollars was raised and the bill almost passed. This go-around, groups lobbying as a by-product have managed to be much more effective when it comes to common interest.
"But this year, a tightly organized coalition has raised more than $4.5 million to defeat a similar ballot question, vastly outspending the measure’s proponents on advertisements, mailings and phone banks."..."The National Education Association contributed $1.5 million through Oct. 15, according to state records, and its state affiliate, the Massachusetts Teachers Association, gave almost $1.6 million."
So, while the NEA's main objective isn't lobbying and raising funds, according to Olson, lobbying as a by-product makes for a successful group and the group is able to overcome free riders.