Spitzer, Spitzer, why not resign?

in the early afternoon on Monday, the 10th of March 2008 by Chad

Gov. Spitzer apologizes to family, public - CNN.com

A source with knowledge of the investigation tells CNN that Spitzer is “under investigation” for allegedly meeting with a prostitute in a Washington hotel.
“I apologize first and most importantly to my family. I apologize to the public, to whom I promised better,” he said.

Right now the Republicans are calling on him to quit. Seems to be a pattern: anyone caught violating the public’s trust like that, the Republicans will call for immediate resignation. Especially when it is their own.

So why the silence from the Democratic party? Are they having an internal debate over whether or not morality and ethics apply to their own?