They investigate senators for ethics violations
yes; those ethics violations are sometimes criminal.
I don't know that Rove has done anything wrong unless I believe your claim that evidence isn't necessary and that your claim of wrongdoing is sufficient, which I don't
Well, if you think hiring/firing people from a job based on discrimination of political affiliation isn't criminal, then, well, thats your perogative; however, to the law, it is a criminal act.
To hire/fire anyone based on religion, sex, gender, ethnicity, political affiliation IS a criminl act, and theres substantial evidence to suggest thats exactly what the Bush admin was doing, and Rove knows it.
Are you suggesting those unethical hiring/firing processes are somehow, legal, and something they should be ALLOWED to do?
The evidence lies with Mr Rove's testimony; now, if he had nothing to hide, he would testify.
Testifying wouldn't be detrimental to national security in anyway, so therefore, there should be no reason why he shouldn't testify.
If he's innocent, he would testify.