what campaigns should seek from organizations

Politics is a form of warfare practiced in collective delusion. There are measures of real world power that shape the delusion--money, volunteers, etc. But most of what happens in politics reflects what people believe to be to be the power relationships.

If this first paragraph doesn't make sense, ask more in the comments.

So, a campaign might pursue endorsements from organizations like they deliver votes. Some organizations deliver a significant number of votes, but mostly they don't directly move many votes.

Organizations can serve as "third party validators". Organizations can give money. Organizations can mobilize campaign volunteers.

But the campaign should have a plan. And organizations should be courted in the context of the plan.