Increasing capital gains taxes back to historical levels doesn't actually get you very far. Maybe another 100-200 billion [1]. Forcing corporations to pay taxes on all money earned in the US instead of tossing it offshore would get you another 90 billion or so [2].

Realistically, almost all of the revenue has to come from increasing personal income tax, probably mostly on the top 5% of earners, but realistically everyone would have to pay more. I haven't yet done the calculations, but it seems like we're talking double digit percentage increases.

[1] http://people.opposingviews.com/percent-irs-revenue-comes-ca... [2] http://www.americansfortaxfairness.org/tax-fairness-briefing...