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Gallup uses three different models. The "traditional" model has Obama +2.
From Gallup:
The "traditional" likely voter model, which Gallup has employed for past elections, factors in prior voting behavior as well as current voting intention. This has generally shown a closer contest, reflecting the fact that Republicans have typically been more likely to vote than Democrats in previous elections. Today's results show Obama with a two-point advantage over McCain using this likely voter model, 49% to 47%, this is within the poll's margin of error.
Full article here
From Gallup:
The "traditional" likely voter model, which Gallup has employed for past elections, factors in prior voting behavior as well as current voting intention. This has generally shown a closer contest, reflecting the fact that Republicans have typically been more likely to vote than Democrats in previous elections. Today's results show Obama with a two-point advantage over McCain using this likely voter model, 49% to 47%, this is within the poll's margin of error.
Full article here