After being virtually tied with Democratic presidential candidate Hillary Clinton for several months, Republican contender Rudy Giuliani now leads Clinton up 47% to 40% in the latest Rasmussen Reports national telephone survey.

In the match-up of the frontrunners, this result marks a significant shift. For the last three months the two frontrunners have never been further apart than three percentage points. Last month, Giuliani and Clinton were separated by just a single point.

These polls don’t mean much at this point, but this can’t make the Clinton camp happy. My guess is that she’s dropped because of attacks from Barack Obama and John Edwards. But if those rather mild attacks make this much of a difference, how will she do in a real campaign?