The difference is that Oswald did not fire a rifle on 11/22/63, Murtha, the NYTs, WaPo, and the rest of the MSM are engaged in a conspriacy to take down this president.
Their agenda is very clear.
But Murtha fits the Benedict Arnold comparison perfectly. Even if he only spent 33 in the reserves with two call-ups he paid his dues. (As opposed to the Christmas in Cambodia former candidate).
Nevertheless, having you feelings hurt and turning on the institutions you swore to protect is about as low as it gets.