text:  Mr. Biden's performance was marked by repeated stumbles and awkward moments of silence. Afterwards, there was a heightened level of concern about his fitness for office. The president's outing was so rough that Democrats are publicly and privately questioning whether he should be the party's presidential nominee. Greg Clugston, Atlanta. Also at townhall.com, a number of Supreme Court decisions announced. One of them, the court upended a 40-year-old decision that made it easier.