If Obama is elected America will become fully Socialist. All of the nation's wealth will be redistributed equally among the citizens, and for a while, there will be peace. Soon, however, the top 3 percentile of formerly-ultra-wealthy Americans will become extremely cranky because they are forced to sleep on mattresses instead of giant piles of money. Sleepless and frustrated, they will be forced to drink huge amounts of coffee in order to remain functional. The caffeine in their bodies initiates a molecular reaction, causing their metabolism to increase at an alarming rate. They are faster, stronger and able to process information five times faster than the average human. In order to maintain their bodies, however, they must consume even more caffeine. They band together and attack coffee warehouses and Starbucks cafes. Their power is so great that local police are unable to stop them, forcing Obama to send in military units. They, too, fail to stop the mutated caffeine addicts who arm themselves with weapons taken from the police and army. The mutants then turn their attention towards Washington D.C., seeking vengeance against the Socialist Dictator Obama.
In order to defeat the mutants, Obama makes an unholy pact with Satan-- trading his very soul in exchange for supreme demonic power. He is able to destroy the mutants, but his new powers came with a price-- his mind is now corrupted by evil. Demonbama rends open a portal from which all of Hell's armies pour forth, ravaging North America and spreading throughout the world.
Frightened that the demons will someday cross the oceans and attack European soil, the United Nations (relocated to France) decides to bomb the western hemisphere. They do so, but the impact of their nuclear weapons is enough to create a crack in the Earth's crust. Oceans begin to pour into the deep crevice, revealing the lost city of Atlantis. The Atlantians, furious that their habitat has been destroyed, launch an attack on Europe. The Europeans are unable to defend against Atlantis' mighty Hydra Riders and Stingray Tanks, and those who survive retreat into Asia.
The Earth's remaining population is unable to support itself without the resources from the destroyed lands, and is inevitably consumed by famine and civil war. National boarders are forgotten and new military factions spring up in the place of countries. Life is a constant battle for control of territory and scarce resources.
The human race is eventually wiped out by itself... and the world falls silent.
EDIT (FYI, I voted for Obama.)