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(AP) -- Sen. Claire McCaskill is endorsing fellow Democrat and 9th Congressional District candidate Judy Baker.

McCaskill also blasted Baker's Republican opponent, Blaine Luetkemeyer, over a negative ad that McCaskill says misrepresents her work as Missouri's state auditor.

The ad refers to a 2002 audit of the University of Missouri Health Care system. McCaskill's audit found that the health care system lost nearly $10 million in unbilled charges and other financial missteps. A doctors' group overseen by Baker for a portion of the time in question lost more than $2 million.

McCaskill told reporters Monday that Baker was "brought in to fix" what she called a "modest problem." She offered a strong endorsement of Baker, a state representative from Columbia.

She also criticized Luetkemeyer for hosting Vice President Dick Cheney at a Monday fundraiser in St. Louis County. Click on the link below to read the 2002 Audit report for yourself.

(Copyright ©2008 by The Associated Press. All Rights Reserved.)