And so, after the majestic, hopeful, and deeply stirring ceremony with which American democracy renews itself every four years, the Bush administration is history. President Obama thanked his predecessor “for his service to our nation,” but for most Americans the departure of the 43rd president came none too soon. Except for Richard Nixon, no president since World War II has departed with higher disapproval ratings than George W. Bush: 61 percent, according to Gallup’s final survey last week. For years it has been fashionable on the left to proclaim Bush the worst president ever - or as a Harper’s headline put it last spring, the “Worst. President. Ever.”

By all accounts, Bush is neither bitter nor self-pitying about being so unloved. That is partly a function of his personality - in his last press conference, he described self-pity as “pathetic” - and partly the result of knowing that it will not be his contemporary critics who render the final verdict on his presidency.

Nothing did more damage to Bush’s popularity, or more inflamed his opponents, than the war in Iraq. Harry Reid, the Senate’s Democratic leader, spoke for countless Americans when he called it “the worst foreign policy mistake in the history of this country.” Barack Obama would almost certainly not be president today had it not been for his fervent opposition to the war during the Democratic primary campaign.

But wars are ultimately judged less by how they unfold than by how they end, and this war appears to be ending in a clear victory for the United States. The conduct of the war in its first years was badly flawed and cost many lives, but the Iraq Bush leaves to his successor is largely unified, stable, and free - an infinite improvement over the dangerous hellhole he inherited in 2001.

The new commander-in-chief acknowledged yesterday that we are at “war against a far-reaching network of violence and hatred.” Among his predecessor’s signal accomplishments are two great turning points in that war: the fall of Saddam Hussein and the defeat of the terrorists who chose to make Iraq the central battlefield of their jihad against civilization. Whatever he may have said as a candidate, the new president realizes that his mission in Iraq is not to undo Bush’s handiwork, but to preserve it.

The Bush presidency had its failures too, of course. Perhaps the saddest - and most ironic - is reflected in the hyperpartisan shrillness of our national politics.

It is hard to remember now, but Bush originally ran for president on an agenda of restoring courtesy and goodwill to the political sphere. He promised to end the “arms race of anger” in Washington, and pointed to his record of bipartisanship in Texas. “I have no stake in the bitter arguments of the last few years,” Bush told the 2000 Republican convention. “I want to change the tone of Washington to one of civility and respect.”

Needless to say, things didn’t work out that way. Some of that was Bush’s fault. As The Washington Post’s E.J. Dionne wrote the other day, Bush “was better at announcing policies than explaining them” and “never really engaged his opponents.” Despite the tenuous nature of his 2000 victory, he often acted as though he had won a mandate for a sweeping agenda most Democrats opposed.

But it’s also true that many of Bush’s bitterest foes, including some in the media, never gave him a chance. It became commonplace to describe the 2000 election as “stolen” and the Bush presidency as illegitimate. Democratic candidates vied to outdo each other in anti-Bush invective. For many, “Bush hater” became a label to wear with pride.

Now it is Obama’s turn to try and bank the fires of partisan rancor. “The stale political arguments that have consumed us for so long no longer apply,” he said in his inaugural address, one day after hosting dinners to honor two leading Republicans, John McCain and Colin Powell. The 44th president and the 43rd embraced each other before the swearing-in, and embraced again afterward. Presidential inaugurations nearly always engender uplifting feelings; sustaining those feelings is a different story. Bush hoped - alas, in vain - to be “a uniter, not a divider.” May Obama be blessed with greater success.