05/01/2010 05:12 am ET | Updated May 25, 2011

Vulnerable Senate Incumbents: The 8 Most At-Risk Senators (SLIDESHOW)

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.

The 8 Most At-Risk Senate Incumbents