Rudy's dive will happen closer to the primaries. Right now his poll numbers are based on name recognition. More people have heard of him than have heard of Romney, and the image they have of him is an image of toughness: The guy who cleaned up NYC, the guy who led on 9/11. When more of the primary voters realize that what we're talking about is running a New York lib against a New York lib, he will drop precipitously.
So who will you vote for??