Gallup is down to 4 yesterday.
There are two problems with Gallup. One is that they've been in a long pissing contest with Obama's DoJ because a whistle-blower inside Gallup dropped a dime on them for overcharging the government for services.
Margin of error: DOJ sues Gallup - Mackenzie Weinger - POLITICO.com
The other is that their sample method assumes the electorate is going to be 79% white, when in 2004, it was only 74% and most believe it will only be about 72% this time. This, incidently is not the method that Gallup uses to determine presidential approval, where 51% actually approve of the job Obama is doing.
And a third problem for Romney: the presidency will be determined by the EC, not popular vote.