You take you best shot when you got it or, a dead bird in the hand is worth two in the bush. Hillary is a liberal and a known evil. Obama is a liberal.
Your statement is true. Hillary would use all means available to squash her enemies. FBI, IRS, you name it, she'd use it. We don't yet know if Obama is so unscrupulous. However, he is as socialist as Eugene Debs. All I want is to throw their party into turmoil and force them to have a brokered convention.
Doesn't that mean that Obama is an unknown evil? Americans already know that Hillary is a wicked bitch (that's why her campaign is foundering), but they have yet to get disillusioned with Obama. Hillary would be a thoroughly unpopular President and people would be much more willing to vote against her and her party in 2010 and '12. Obama, on the other hand, would be seen as almost a saint, or certainly as an idealistic young leader trying to change his country with his enlightened policies, to do away with centuries injustice, etc., what not. His policies would not be unpopular, even though they would be the same policies (or worse) as Hillary's.
A known evil is always easier to deal with than an unknown one. This is what my tagline is all about.