Treason is really tightly defined, and almost no one has ever been convicted of treason in the United States.
However, Espionage is a relatively common crime and seems to fit. Also, a large number of people have been successfully prosecuted for just that.
A definition of espionage:
"the practice of obtaining secrets (spying) from rivals or enemies for military, political, or economic advantage. It is usually thought of as part of an organized effort (i.e., governmental or corporate)."
http://en.wikipedia.org/wiki/EspionageMy read is that Rove committed espionage by working FOR the Bush Administration and AGAINST the United States. Perhaps the closest example of this is industrial espionage. An example of a similar scenario would be if someone working for Bill Gates didn't like the nasty things the government was saying about Bill, so obtained and disclosed secret information about a CIA agent to the press (and thus, to foreign entities) to discredit the government, causing damage to US intelligence interests. Clearly espionage. If he acted on his own, then he was spying to obtain secret information to use to the benefit of specific individuals (not the government). If he acted in concert with others, then it was a conspiracy to commit espionage against the United States. The fact that they are government officials is irrelevant. For example, a US Ambassador could be charged with espionage. Again, since the United States was damaged by his actions, it really doesn't matter who he was working for, and it fits with the definition of espionage.
What do you think?