If Hillary had never compared McCain favorably to Obama, there would be no problem with a "unity" ticket.

There is simply no way for her to be able to answer the question of why it is that she would serve as VP to a person she said was not competent to serve as Commander in chief.

She never asserted Obama was not ready to be Commander-in-Chief.  That's your answer.

duh, she's not planning to die on day one?  She'll leave a manuel? he'll have her team in place and they can fill him in?  

Obama will pick the person he thinks can best expand the map.

The nomination has not been finalized yet and I have no opinion as to whether Clinton, if offered the VP position (assuming Obama wins the nomination) should accept.  So I'll restrict myself to answer your question which is, if Hillary has sharply criticized Obama during the campaign, doesn't that make it illogical for her to be offered or to accept the VP slot?

The answer to that is a definitive no.  Candidates always criticize each other during campaigns, and always make up after it's over and support each other, often offering each other VP slots or other cabinet positions.  That's just the way it works in the real world.  Edwards criticized Kerry a lot, Bush 1 criticized Reagan a lot, and Johnson criticized Kennedy a lot.  That's just the way things work and everybody understands it.

I didn't want to speak for Hillary - I'm not a supporter so I wanted to see what supporters would say.  I don't see any answers here, just a little more bickering.  But there is an answer if Hillary is ready to change, if without the stress of running for President she can do something she should have done from the start:

Admit she was wrong.  She would have to say she learned a lot during the campaign - a lot about Obama, a lot about the country, and a lot about herself.  With Obama, he showed  strength and leadership qualities she didn't know were there, that during the tests of the campaign he's proven himself to be a leader and shown that the judgement he displayed about the Iraq War from the start was more than a just a speech. To imply otherwise was wrong on her part.  About the country, she learned how strongly, how desperately they want and need change.  Not some small move around the edges change, but big, drastic, central change of how Washington works.  And of herself, she learned to speak with her own voice, not some idea of how she should respond based on politics or polls.  She learned it is important both recognize and admit her mistakes, and then she needs to admit her mistake and apologize for the vote on the War.  If she could do all that I think we really could have a unity ticket which would be unstoppable.  I just don't know if that is an Obama vision of Hillary which is completely divorced from reality.

Things are said in the heat of battle.  He said that she was disingenuous and would say anything to get elected.

At one debate last summer, the first fifteen minutes of the debate was basically all of the other candidates criticizing Obama's statement that he was willing to meet with the leaders of Iran, Cuba, Venezuela, North Korea, and Syria anywhere in the world without precondition.

If he were to offer her the VP (and we are far away from that), there would be a bunch of questions for two days and then the debate would move on to something else.

"I think that I have a lifetime of experience that I will bring to the White House. I know Senator McCain has a lifetime of experience that he will bring to the White House. And Senator Obama has a speech he gave in 2002."

Not the sort of thing that gets you the VP position on a ticket