This Insider Advantage survey from Pennsylvania shows Clinton's lead now cut to just two points (45%-43%)--continuing the Obama surge several of us have discussed in the last couple of days. While they don't report details on the sampling procedure, I assume those numbers are within the margin of error and we can now call this pivotal state a "dead heat." A PPP poll released yesterday shows similar results. Insider Advantage reports some crosstabs, and differences within subgroups are pretty dramatic--in the direction we've seen before, only bigger. For example, Obama wins the under-30 crowd, 70.0%-26.5%, while Clinton sails among seniors, 54.2%-32.8%. Clinton also wins women by 11 points, but loses among men by nine points. One other interesting tidbit from the Insider Advantage poll: Hillary Clinton draws nearly a third of the African-American vote--somewhat higher than I would have expected. The PPP poll referenced above shows Obama getting about 75% among blacks, a number more in line with recent primaries.