So, while many Americans were busy contributing money, clothing and other necessities for hurricane-devastated Gulf Coast residents, what was Sen. Chuck Schumer up to? Raising money off the backs of Katrina's victims — for the Democratic Senate Campaign Committee. In one of the more cynical tricks we've seen lately, Schumer's DSCC urged visitors to its Web site to sign a petition urging the firing of Federal Emergency Management Agency Director Michael Brown, the focus of much of the criticism of the federal response to Katrina. (Indeed, Brown was summoned back to Washington yesterday as Coast Guard Vice Adm. Thad W....