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Silk expects the other side will spend $4 million to $7 million.

“We take them at their word and we need to dig deep,” he said.

A call to the Preserve Marriage Washington office early Friday morning was not answered.

Silk said that despite the recent big-name donors, 80 percent of his organization’s 8,000 donations have been for less than $200.

“This is a grassroots movement,” he said. “This is an issue of fundamental fairness.”