Health contractors vetted stars' politics for US virus ad

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This photo combination shows from left: musician Christina Aguilera in Los Angeles, March 29, 2012, comedian George Lopez in Los Angeles, Dec. 25, 2012, and actor Jack Black in Las Vegas, April 25, 2012. Public relations firms hired by the Department of Health and Human Services vetted the political views of hundreds of celebrities, including Aguilera, Lopez, and Black, for a health education advertising campaign on the coronavirus outbreak. That's according to documents released Thursday by a House committee. (AP Photo)