Because, internationally she is a neocon. John Bolton without the mustache. And it evident in a new long Atlantic article where she is distancing herself from Obama.
http://www.theatlantic.com/...
In 2008, I argued with my female relatives that it had to be Obama. Hillary would be too divisive and the election would be close. Close enough to steal. With Obama, it would be a too big a margin to play Florida or Ohio games. And we had to get the Republicans out. (more below)