Since the margin of error for the poll is +/- 3 percent, that puts the candidates in a statistical dead heat. Yesterday's daily tracking poll had at Obama at 50 percent and Clinton at 44.
The survey was conducted May 13-15. During that time, Clinton won the West Virginia primary and John Edwards endorsed Barack Obama.
Gallup notes that the "slight narrowing of the race ... is typical of the way the contest has gone over the past several months, with neither candidate able to maintain a significant lead among national Democratic voters for very long."
There has been a small change in hypothetical match-ups with Republican John McCain. McCain is ahead of Obama, 47-45 percent among registered voters (the two were tied at 45 yesterday). With the margin of error at +/- 2 percent, that also puts them in a statistical tie. But against Clinton, McCain fares signficantly worse: Clinton has a 3 point lead 48 - 45 percent.
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