It all comes down to the biggest pain of current elections: strategic voting. If there was an ideal candidate you wouldnt vote for him because you d vote less bad so that more bad does not claim the throne. There are numerous systems which solve this problem but somehow both less bad and more bad dont have any reason to establish them. Of course there are many other faults with current voting systems and especially US system. If you want a proof that the system is fucked and needs to be abolished look at 1992 usa elections - not only did 19% of votes equate to 0(!) spots in the house or senate, there is a reasonable arguement to be made that the fact that Ross Perot entered the election has changed its outcome (spoiler effect). It is sad that US elections have reached an equlibrium where there are only two possible candidates who dont even have to try. After all "47% of the people will vote for the candidate no matter what" (intentional misquote)