No Republican, not even Ron Paul, is going beyond the status quo to insist that top marginal tax rates must be cut by at least a third (ideally scrapping the current income-tax system altogether and replacing it with a pro-growth, low-single-rate tax system that does not punish saving, investing and entrepreneurial risk-taking as the current progressive income tax does).

FORBES: Memo To The President: We Can't Tax, Spend And Print Our Way To Prosperity

Sensibly, President Putin has thrown out many of these exactions and given Russia a single-rate, flat tax system.

FORBES: Fact and Comment

The Bush Administration's proposed new savings accounts are a step--a remarkably bold one--toward a radical tax change in the U.S. This revolution is moving toward what I and others have long advocated: a flat tax--an income tax system with a single rate that would apply after a high threshold and that would exempt levies on capital gains, dividends and interest.

FORBES: Fact and Comment

First, an income-tax system with a single rate remains progressive the rich pay a higher proportion of their income than the poor as long as it is combined with a tax-free allowance.

ECONOMIST: The Conservatives toy with a politically risky idea

He has advocated a simple two-rate personal income tax system, under which individual taxpayers could fill out their returns on a single sheet of paper.

FORBES: What Next?