Michael Tomasky writes in the Guardian about Clinton’s speech:

She held a rhetorical knife to Obama’s throat and said, in not so many words: I’m still calling some shots, buddy. You offer me the vice-presidency, or I walk away. But she has also forced Obama into a situation whereby if he chooses her now, he looks weak. So that’s the choice she is hoping to impose on the nominee: don’t choose me, and Bill and I will subtly work to see that you lose; choose me, and look like a weakling who can’t lead the party without the Clintons after all. Now that’s putting the interests of the party first, isn’t it?