Here's the thing, Baltar is slick, good looking, charismatic and very popular. There is one small problem, he is a complete d-bag. Everyone on Galatica knows that a Baltar presidency would be a disaster. He primary issue is selling the people of the fleet to stop running from the Cylons and settle on a barely habitable planet.
On the eve of the election president Roslin has the means to steal the election. She is faced with the moral dilemma of whether she should violate the trust and steal the election; knowing it is the best thing for all the people or should she play by the rules and let the people step in front of the train they are intent on stepping in front of?
Well Barack Obama IS Gaius Baltar.