The news that Sen. Blanche Lincoln (D-Ark.) will face a primary challenger from her own party underscores the anti-incumbent wave sweeping the country.
Combined with the growth of the Tea Party movement, many incumbents will be in a tough position heading into the November midterm elections.
Who's up? Who's down? Here is the Huffington Post's rundown of this year's most vulnerable Senate incumbents.
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As Americans head to the polls in 2024, the very future of our country is at stake. At HuffPost, we believe that a free press is critical to creating well-informed voters. That's why our journalism is free for everyone, even though other newsrooms retreat behind expensive paywalls.
Our journalists will continue to cover the twists and turns during this historic presidential election. With your help, we'll bring you hard-hitting investigations, well-researched analysis and timely takes you can't find elsewhere. Reporting in this current political climate is a responsibility we do not take lightly, and we thank you for your support.
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