walfredo
Charla- right now it is still kind of undemocratic to make a call for her to withdraw, based on her still mathmatically being alive (heck its only 66%). When that goes out the window after the North Carolina, and Indiana primaries, and she is completely eliminated mathmatically, watch for the pressure to grow exponentially.
For better or for worse, there is no getting around letting these next 3 primaries, and 4 weeks leading up to them, play themselves out. It could be a positive for Obama, in that it will show he can win comptetitive contests after the Wright controversy, and to establish that prior to the general election. If Hillary withdrew now, that would be a big motza ball hanging out.
At the end of the day, people in power will pivot away from a candidate whose only chance is to destroy the other candidate, and hope he is hit by meteor, and as polling is starting to make clear, that will be the case after the North Carolina, Indiana primaries.