There still are Kennedy Democrats; there are Clinton Democrats. There are fewer Obama Democrats.
This reflects more the president's style than his substance; he's in the mainstream of his party, so popular that any primary challenge was out of the question.
Yet he remains strangely unfamiliar to some core constituencies.
If Barack Obama is re-elected, the biggest challenge won't be ideological: He's not the left-winger his opponents depict. The economy will be the dominant issue, events will shape others.
Instead, it may be personal, his political persona. Be it Democratic politicians or members of Congress, campaign contributors or business leaders, there is a common refrain: Obama doesn't much identify with us, or even much respect what we do.
His relationship with most Democratic members of Congress lies somewhere between correct and cold. They believe that personal political loyalties are not an Obama priority.
What makes this more than an insider's game is that successful presidents -- Franklin D. Roosevelt, Lyndon Johnson (domestically), Ronald Reagan and Bill Clinton -- cultivated and established real political relationships.
Could a re-elected Obama improve in this essential element of presidential leadership?