There is much exploitation of situations like this, but Obama is not Cheney, today's Democrats are not today's Republicans, and I don't think the US will do any such thing.
I wouldn't put it past either party in the past, but just as we've stopping using assassination, terrorism etc. against any left-wing Latin American leader, it changed.
At least until Jan 20, 2013.
Democrats share the long history of ruthless policies in the past, but for a veriety of reasons, that happens less now. However, other nations can do it, too.
The only person in place to take power from Mubarak looks like a pretty bad figure, unfortunately, but there seems to be a vacuum, and a big chance for a bad power grab.
Do you support democracy - or do you support democracy when it benefits you, and are happy to deny other people's rights if it doesn't?
(Cue the righties claiming I'm excusing Obama's problematic polices).