I say the higher end ought to help out more.
I'm in no means rich. This is just a difficult question... And bias at that! Just saying, rich people aren't the only one's who can be greedy. Of course the poor want the higher end to help out, but the one thing you have to remember is that the rich weren't always rich. It came a time where hard work payed off. You can't reward a population of laziness.. Success stories are so popular now-a-days. It's not like poor people can't become successful. It just takes hard work and dedication. As Americans we all have equal opportunity.
In saying all of this, there definitely is a hierarchy where money stops being a problem. Only at that point do I agree with the above statement. Overall though, being equal citizens with equal rights and expectations I think we should all pay the same percentage of taxes. It's only fair. It's only America.