A Democratic race that a couple of months ago was celebrated as a march toward history — the chance to nominate the nation’s first woman or African American as a major-party candidate — threatens to leave lingering bitterness, especially among Clinton supporters, whose candidate is running out of ways to win.

Some women complain that Clinton has been disrespected and mistreated by the media and the political establishment. Many see Obama as equally condescending, dismissing Clinton’s foreign policy role as first lady, pulling out her chair for her at debates and suggesting offhand during one debate that she was “likable enough.”

With equal ire, many African Americans complain about Clinton’s negativity and have accused her camp of using Obama’s race against him. Her comment that his “support among working, hardworking Americans, white Americans, is weakening again” was just the latest in a series of over-the-line comments, some said.

And many among the legions of young voters who have flocked to Obama say their enthusiasm is more about him than about the Democratic Party and it would not necessarily transfer to Clinton if she won the nomination. In Indiana, about six in 10 Obama voters under age 30 said they will be dissatisfied if Clinton is the nominee and about half said the same in North Carolina, according to exit polls.

Nationally, about a quarter of Clinton supporters in a Washington Post–ABC News poll said that if she loses they will ditch the Democratic Party and Obama for Sen. John McCain (R-Ariz.). A similar number of Obama backers said they will pick the Republican this fall if Clinton becomes the nominee. In both Indiana and North Carolina, majorities of African American voters said they will be unhappy if Clinton is at the top of the ticket.

Acutely aware of these dynamics, the campaigns have sought to balance tactics against tact, so that the rift between the two Democrats — and their backers — doesn’t grow so wide that the winner can’t pull the party back together. Since the May 6 contests in Indiana and North Carolina, Obama has tried to ease much of the animosity by turning his attention to McCain, highlighting differences with Clinton only in response to voters or the news media. Clinton has also shifted some of her strategy, running positive ads in West Virginia rather than the negative ones she aired in previous states.

Once a nominee has been chosen and the ticket is settled, that is when all the question will be answered.  But personally, I feel that regardless which candidate gets the nob, the supporters of the losing one will either switch to McCain or will just stay home in November.