Once you take state and local taxes into account, the U.S. tax system doesn't hit the top one percent all that much more than the middle-class.
Mitt Romney won't say how his tax plan adds up. Wonkblog created a tax policy calculator that lets you do the work for him. So go on, give it a try. Reform the tax code.
Citizens for Tax Justice points out that the White House's $150 billion price tag on Obama's one-year tax cut extension only appears to include part of the total cost—the income tax cuts. Obama's own 2013 budget includes a permanent fix to the Alternative Minimum Tax and some relief from scheduled estate tax hikes, which are both separate from the standard income tax. Adding these in would add $80 billion to the total.