Your argument is that we should aspire to merely "just better than the other guys", with the subtext that Democrats aren't really any better than Republicans.
'muhfuhkah' pointed out that it IS better. Which is worth pointing out in a two party system.
We just watched a whole bunch of people make your same arguments, saying Obama wasn't perfect so whatever they're all the same, and as a result we elected a guy who's much worse in every possible way. Great job, everyone.