There was a Democratic Caucus held yesterday in Iowa you idiot.
A Caucus is in lieu of a primary. A primary is not a prerequisite to a caucus. Just because there is only one name on a ballot doesn't mean a primary isn't held. There is such a thing as write-in ballots that party members have a right to.
Your understanding of politics sure explains why the blacks took over the government in South Africa. You really need to focus your political learning there before even going into American politics.
Since you seem eager to educate me despite being a laughably ignorant fuck, here is a starting point.
http://en.wikipedia.org/wiki/Iowa_De...caucuses,_2012