Opponents of the anti-gay marriage amendment got a huge cash infusion this week when a Michigan man gave $325,000 and the Human Rights Campaign gave another $250,000.

Billionaire Jon Stryker, heir to a medical products fortune, gave $325,000 to Freedom to Marry Minnesota on Tuesday.

On Monday, the Human Rights Campaign gave $250,000 to marriage amendment opponents. HRC gave the same to efforts in Maine, Maryland and Washington where voters will be voting on legalizing gay marriage as opposed to banning it in Minnesota.