A pair of liberal groups are spending $800,000 on a TV spot to boost Arizona Democratic Senate candidate Richard Carmona in a race that until recently had trended Republican.

The League of Conservation Voters (LCV) and Majority PAC are working together on the advertisement, which will air Saturday through Nov. 6. The ad hits GOP candidate Rep. Jeff Flake for a voting record that the groups say is influenced by his past job as a lobbyist for a uranium-mining firm.

“No wonder Flake sponsored legislation to allow uranium mining that would threaten the Colorado River,” the advertisement says, referring to a rider Flake tacked onto the fiscal 2012 Interior Department appropriations bill that would have permitted uranium mining near the Grand Canyon.

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