Even before the Gulf of Tonkin incident, the CIA was involved in Vietnam. Their actions there predated the onset of the actual war. With military air strikes being layered in before the ground war really got started. The CIA was their for training as well as intel. There was a path of escalation.
Now it turns that the CIA was apparently there in Libya before the the no fly zone was put in place. The point is that there was a path of escalation in Vietnam that has an eerie resemblance to the situation early on in Libya. Is this a repeat of Vietnam? It's way too early for any serious consideration of that, but if you see some Libyan forces attack on U.S. personnel, planes or even ships, I'd be prepared for a response just like the Gulf of Tonkin response. Likely? No, but certainly possible.
The Vietnam war was started by a Democrat, so I'm just throwing the idea out there as a not fully formed notion, much the way the Libyan response from Obama didn't seem to be fully formed. Except with the news about the CIA, I'm not so sure there wasn't some sort of escalation path the White House may have had in mind all along.