Can a raisin make flat Champagne bubbly again?

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The website PureWow claims that you can revive a bottle of flat Champagne using a raisin. Hoda Kotb and Jenna Bush Hager give it a try, and to their delight, the technique works! “But does it taste like a raisin?” Hoda asks as Jenna takes a sip. “No, because a raisin is a grape!” Jenna replies.