On April 22, Clinton scored a convincing win in Pennsylvania. However, on May 6, Obama surprised many observers by winning North Carolina by almost 15 percentage points, effectively erasing Clinton's gains in Pennsylvania. Clinton won by only 1 point in Indiana. With Obama now leading by 164 pledged delegates and with only 217 pledged delegates left to be decided in the remaining contests, many pundits declared that the primary was effectively over. Obama gave an election night speech that looked forward to the general election campaign against McCain. The pace of superdelegate endorsements increased. On May 10, Obama's superdelegate total surpassed Clinton's for the first time in the race, making the math increasingly difficult for a Clinton win.