The latest USA TODAY/Gallup Poll finds McCain ahead of Obama by 4 points among "likely" voters. A month ago, the USA TODAY/Gallup Poll had McCain behind by 6 points among "likely" voters.
According to Tom Bevan, this is McCain's first lead since May:
This is the first poll showing McCain with a lead over Obama since a May 1-3 Gallup/USA Today survey showed him with a slim 1 point lead. A Fox News poll at the end of April had McCain up 3.
With today's Rasmussen and Gallup tracking both ticking down for Obama (-2 and -1, respectively) and a new Dem Corps poll showing Obama up five, the new RCP National Average has Obama's lead over McCain dipping to 3.2%
It's just one poll, so take it with a grain of salt.
Now that we are down to the final 100 days, I will pay more attention to polls.