The fiscally conservative group Club for Growth is going on the airwaves in Iowa to attack Democratic presidential hopeful Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.), who is running at the top of the polls a week before the state's caucuses.

Conservative groups generally don’t spend a lot of money in contested Democratic primaries. But with Sanders gaining momentum, Club for Growth will go on the air with a new television ad this week to attack him as “too old and too liberal.” The 30-second ad will run in Des Moines through Feb. 2.

“Bernie Sanders wants to be our 46th president but he’s nothing like the rest,” the narrator in the ad states. “More radical than Obama on health care. Bernie’s plan gives government health insurance to everyone. His socialist Green New Deal? Even bigger than the New Deal, transforming the economy to meet extreme environmental standards. And at 79, he’d be our oldest president ever. Even his age is extreme. Too old and too liberal.”

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Sanders has led in three of the past four major polls of Iowa and opened up a 9-point lead in the latest Emerson University survey of the Hawkeye State.

President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE and his allies have taken notice and have recently stepped up their attacks against Sanders.

“With Bernie Sanders rising in the polls, the potential for a radical socialist as the Democratic nominee has never been more real,” said David McIntosh, the president of Club for Growth’s political arm.