Sheldon Adelson is doubling down on Newt Gingrich.

After boosting the former House speaker’s White House bid with $11 million that he and his family have given to a pro-Gingrich “super PAC,” the billionaire casino executive recently made another substantial donation to the Winning Our Future group, according to a person familiar with the contribution.

In recent weeks, there have been suggestions that Adelson would hedge his bets by asking that further donations be used to go after former Sen. Rick Santorum of Pennsylvania, which would also benefit former Massachusetts Gov. Mitt Romney.

But a source said the latest contribution came with no strings attached.

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