[CJefferson]

Your comment is a commonly claimed statement, which hides many points.

How much of the income does the top 50% get? Without that, your figures are useless.

Just concentrating on income tax hides the fact lower earners tend to spend a higher proportion of their income on other taxes (such as sales tax).

ycombinator is not the place to repeat poorly researched, often quoted and misleading statistics, without a proper discussion of how they effect the current discussion. Sorry.