clyburn has tested positive. he says he has been vaccinated and boosted. he has no symptoms, and he has been quarantining since sunday. his experience speaks to a larger issue. it took three days three days for the democratic leader to get a test result. just like everybody else. amazon and walmart joining cv zss and walgreens limiting the number of covid tests you can buy. president biden addressing the covid test last night. cnn s jeff zeleny has more from the white house. reporter: christine and paula, president biden bluntly acknowledged that he struggled to contain this covid-19 surge in the winter. he said nothing has been good enough. he acknowledged that testing has been a problem. he said he wishes he could have dunmore. but also struck a very defensive tone in that new abc news interview taped on wednesday here at the white house. the president defended his administration s response when he said this. no, i don t think it s a