During the Democratic Party National Convention last month in Denver, Sen. Barack Obama and his supporters talked a lot about what he will do if elected president. But the question of what Obama has not done will hang over his head during the weeks leading up to the Nov. 4 election.
Supporters of Sen. Hillary Clinton, barely defeated by Obama for the Democrat nomination for president, still are bitter, according to many reports.
And why not?
Obama seems to have done little to satisfy their desire for more influence in his campaign.
Sen. Joe Biden is Obama's choice for his vice presidential running mate.
Clinton supporters who had hoped she would get the nod - even a symbolic offer of the second-place spot which she, naturally, would have turned down - were disappointed.
Clinton herself is a professional. She will be a good soldier, speaking out strongly and loudly in favor of Obama. Her supporters expect no less.
But they also expect at least some deference from Obama - and they have not yet received it.
That is a problem that will come back to haunt Obama if he does not swallow his pride and do something to pacify the Clinton supporters.