Opinion by Rachel Held Evans, special to CNN

(CNN) - On March 24, World Vision announced that the U.S. branch of the popular humanitarian organization would no longer discriminate against employees in same-sex marriages.

It was a decision that surprised many but one that made sense, given the organization’s ecumenical nature.

But on March 26, World Vision President Richard Stearns reversed the decision, stating, “our board acknowledged that the policy change we made was a mistake.”

Supporters helped the aid group “see that with more clarity,” Stearns added, “and we’re asking you to forgive us for that mistake.”

So what happened within those 48 hours to cause such a sudden reversal?

The Evangelical Machine kicked into gear.

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