Shortly after Thanksgiving I had dinner in California with Ronald Reagan's best biographer, Lou Cannon. Like many historians these days, we discussed whether George W. Bush is, conceivably, the worst U.S. president ever. Cannon bristled at the idea.

Bush has two more years to leave his mark, he argued. What if there is a news flash that U.S. Special Forces have killed Osama bin Laden or that North Korea has renounced its nuclear program? What if a decade from now Iraq is a democracy and a statue of Bush is erected on Firdaus Square where that famously toppled one of Saddam Hussein once stood?

There is wisdom in Cannon's prudence. Clearly it's dangerous for historians to wield the "worst president" label like a scalp-hungry tomahawk simply because they object to Bush's record. But we live in speedy times and, the truth is, after six years in power and barring a couple of miracles, it's safe to bet that Bush will be forever handcuffed to the bottom rungs of the presidential ladder. The reason: Iraq.

Some presidents, such as Bill Clinton and John F. Kennedy, are political sailors -- they tack with the wind, reaching difficult policy objectives through bipartisan maneuvering and pulse-taking. Franklin D. Roosevelt, for example, was deemed a "chameleon on plaid," changing colors regularly to control the zeitgeist of the moment. Other presidents are submariners, refusing to zigzag in rough waters, preferring to go from Point A to Point B with directional certitude. Harry S. Truman and Reagan are exemplars of this modus operandi, and they are the two presidents Bush has tried to emulate.

The problem for Bush is that certitude is only a virtue if the policy enacted is proven correct. Most Americans applaud Truman's dropping of bombs on Hiroshima and Nagasaki because they achieved the desired effect: Japan surrendered. Reagan's anti-communist zeal -- including increased defense budgets and Star Wars -- is only now perceived as positive because the Soviet Union started to unravel on his watch....

There isn't much that Bush can do now to salvage his reputation. His presidential library will someday be built around two accomplishments: that after 9/11, the U.S. homeland wasn't again attacked by terrorists (knock on wood) and that he won two presidential elections, allowing him to appoint conservatives to key judicial posts. I also believe that he is an honest man and that his administration has been largely void of widespread corruption. This will help him from being portrayed as a true villain. This last point is crucial. Though Bush may be viewed as a laughingstock, he won't have the zero-integrity factors that have kept Nixon and Harding at the bottom in the presidential sweepstakes. Oddly, the president whom Bush most reminds me of is Herbert Hoover, whose name is synonymous with failure to respond to the Great Depression. When the stock market collapsed, Hoover, for ideological reasons, did too little. When 9/11 happened, Bush did too much, attacking the wrong country at the wrong time for the wrong reasons. He has joined Hoover as a case study on how not to be president.

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