dredging up the Wichita Massacre puts the two justices who were part of the 6-to-1 majority ruling in the spotlight.
dredging up Lewinsky, on the other hand, shows that some care was taken to cultivate conservatives.
late 15c., in Scottish dreg-boat "boat for dredging," perhaps ultimately from root of drag (possibly via Middle Dutch dregghe "drag-net"). The verb is attested from c.1500 in Scottish. Related: Dredged; dredging.
(Job 24:6). See CORN.