Why Won't Clinton Release Her Tax Returns?

So, in 2000 Hillary Clinton demanded Lazio release his returns. She made all sorts of hay about it.
Jump forward.
It's now 2008, Hillary Clinton is running for President. She now refuses to release her returns until she is the Democratic nominee (she said as much in a debate). Why is she waiting? She demands others to release theire returns, but she is exempt? Why? Oh, that's right, Hillary Clinton doesn't have to play by the same rules - she'a Hillary Clinton and is above all that. Shameless.

via Americablog