By engaging Hillary, Rudy Giuliani is making a wise strategic decision. In all the polls, Rudy is seen as the candidate most likely to defeat Hillary Clinton. By attacking her, he emphasizes this quality and overshadows Fred Thompson and Mitt Romney. The presidential races in each party are taking on the aspect of an audition rather than a primary. Voters are supporting the person who is most likely to beat the other party, not the one they most agree with on the issues or like or trust the most. In this atmosphere, Hillary and Rudy are mutually supporting bookends, each keeping the other on top by the perception of their own electability.