It seems likely. Ron Junior is just idealistic enough to think that the dems invited him to speak at their convention because they valued what he had to say. Instead, they used him like a prop the way they use Max Cleland. (Or USED prior to Rathergate - I notice Kerry doesn't mention Max much anymore).
After Kerry flubbed the stem cell answer, it had to be obvious to Ron that Kerry was just using the issue to discredit Bush and that he doesn't give a rat's rump about actually curing anything (or solving any other problems for that matter).
I think you're right. Ron's wimpy, not stupid.