I thought it was the other way around with governors being a step down from the senate.
Sure there are twice as many senators, but they get 6 year terms and governors get 4. Senators also have to be a minimum of 30 years old, while governors can be just 25. Lastly, senators are on the national stage while governors are of course only on the state level.
That's pretty selfish and you share that sentiment with the GOP. They know they can't win but they want to preemptively weaken her for 2008.
I think it will backfire -- all this will do is result in the most expensive senate campaign in US history and lots more national coverage for Hillary to not only defend her seat easily, but also simultaneously run a prep campaign for 2008, further defining her image and impression in the mind of the mainstream voter. If she plays it right, this could be some great momentum going into the primaries.
Hillary used to be a liberal icon and most of her history she's been a liberal activist. Many of the left have conveniently forgotten this since she became senator, but if she became president I have no doubt she'd try and take some of the liberal things she wanted to accomplish under Bill and reframe them in a way that would look more moderate. Universal healthcare for example...maybe not titanic reform, but she'd pull back Bush's protection of the pharmaceuticals and HMOs.
He did it because he was up for election soon in Arizona and was vulnerable. He exchanged his loyalty for Bush's promise to support his re-election. His moderate positions comes with the downside in that he alienates the base which needs to be shored up prior to each new term.