This morning's CNN poll gives Barack Obama the national lead over Hillary Clinton — the first time ever that Obama has led in a major national poll, though the result is still technically a statistical dead heat. Here are the numbers, compared to the last poll from just over two weeks ago:

Obama 49% (+16)
Clinton 46% (+4)

This poll would seem to indicate that Obama is picking up most of the former John Edwards supporters, as well as a good number of the undecideds.