[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/POLITICS/01/05/giuliani.senate/art.rudy.giuliani.gi.jpg caption="Rudy Giuliani says New York needs an advocate in the Senate who also understands America's needs."]
Special to CNN
Now that President-elect Barack Obama has nominated Sen. Hillary Clinton to be his secretary of state, the governor of New York will appoint a new senator to fill the vacancy.
The relationship between the mayor of a large city and a United States senator from that city's state reveals the genius of the U.S. Constitution.
A good senator must perform two tasks simultaneously - advocate for the interests of his (or her!) state while also helping to shape the direction of the entire country.
As mayor of New York City, I thought of our U.S. senators as New York's advocates in Washington. All of New York's senators during the time I was mayor - Alfonse D'Amato, Daniel Patrick Moynihan, Charles Schumer and Hillary Clinton - were effective advocates for New York City.
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