The Pew Research Center reported last week that President Barack Obama "has the most polarized early job approval of any president" since surveys began tracking this 40 years ago. The gap between Mr. Obama's approval rating among Democrats (88%) and Republicans (27%) is 61 points. This "approval gap" is 10 points bigger than George W. Bush's at this point in his presidency, despite Mr. Bush winning a bitterly contested election.

Part of Mr. Obama's polarized standing can be attributed to a long-term trend. University of Missouri political scientist John Petrocik points out that since 1980, each successive first term president has had more polarized support than his predecessor with the exception of 1989, when George H.W. Bush enjoyed a modest improvement over Ronald Reagan's 1981 standing.

But rather than end or ameliorate that trend, Mr. Obama's actions and rhetoric have accelerated it. His campaign promised post-partisanship, but since taking office Mr. Obama has frozen Republicans out of the deliberative process, and his response to their suggestions has been a brusque dismissal that "I won."

Compare this with Mr. Bush's actions in the aftermath of his election. Among his first appointments were Democratic judicial nominees who had been blocked by Republicans under President Bill Clinton. The Bush White House joined with Democratic and Republican leaders to draft education reform legislation. And Mr. Bush worked with Republican Chuck Grassley to cut a deal with Democrat Max Baucus to win bipartisan passage of a big tax cut in a Senate split 50-50 after the 2000 election.

Mr. Obama has hastened the decline of Republican support with petty attacks on his critics and predecessor. For a person who promised hope and civility in politics, Mr. Obama has shown a borderline obsessiveness in blaming Mr. Bush. Starting with his inaugural address and continuing through this week's overseas trip, the new president's jabs at Mr. Bush have been unceasing, unfair and unhelpful. They have also diminished Mr. Obama by showing him to be another conventional politician. Rather than ending "the blame game," he is personifying it.