Q: Well, what do they all have in common?
A: They were all drinking at the bar.
Remember how that fellow at the bar said he would 'surprise' Roslin's assistant? Possibly the president isn't the only one who's been ingesting hallucinogenic drugs.
Not only that, but RDM mentioned that we would see another Cylon model. Well, nobody would suspect the bartender.

On a ship as big as the Galactica, with as many refugees as are on the Galactica, it's not like anyone would really notice if a new face happened to pop up in the bar. Maybe he even started the bar.
The more I think about it, the more devious a plan it becomes...
EDIT: View 5000, woohoo!