US Elections are easy. And bollocks, at the same time.
Two vaguely similar candidates are picked seemingly at random from their platforms, or sponsor groups, also known as the only two political parties in the US. Repuclicans and Democrats, as opposed to the swedish system where we have over 14 parties at any one given time of various goods and bads for the rich and poor.
Irregardless, these two thrashtalk eachother and depending on the quality of it earn voter points in the various regions, or states of the US. Once a region has reached a conclusive vote, they side with one candidate and net him bonus votes. The battles for these votes can become rather intense and even propagate scandals, such as Watergate. Which is odd since Presidency is more than flinging missiles at people you don't like. You have a insane population of people to care for, some even dumber and accident prone than the dwarves we know and love.
So pleasing them all is akin to filling a colander to the brim. In a desert.
Once a candidate has enough votes before the voting period is up, (having gotten 50% of the population to actually BOTHER to vote is a amazing achievement by these standards) he can look forward to being nagged, berated, dumbfounded and insulted by a quarter of the globe just for being in office, everything you say, do, do not do will be taken out of context and thrashed by the medias for the next four years. Just as the olympics. And if you royally mess up, or manage a semblance of "being good at it" you get another four years in office. But no more, you could be the god Emperor of Man for all we care but the words in the holy constitution is law. Unless you change it. And get the senate to agree to it.
If you loose, well you can always demand a recount, until you win. Because sweet nellie there are a lot of ballots to double-check.
Failing that, the supreme court will pick a president by picking a name out of a hat worn by J.F.Rosewelt.
Now, how the president senate and supreme court work in tandem to bring a semblance of goverment to all these semi-independent states, that's another topíc I refuse to touch. Good luck on your powerpoint