I don't know about that (as always I could be wrong). I think it's more a case of allies of convenience getting together. On the left it an almost visceral hatered of America, an America that rejects them and their "ideas".
On the right (Buchanan) it's similar in the America has rejected him and doesn't what to go back to 1934.
Llewellyn H. (“Lew”) Rockwell Jr. Well he's just nuts.
David Duke a racist pig who's time has come and quickly gone.
I used to feel the way you did until the 2000 election, and the attacks on GW from both quarters were often cloned attacks from the pseudo right and the vile left. After the election, both camps became more shrill and again sounded like clones.
Their responses right after 9/11 re the Islamofascists and the Jooooos again were too similiar not to be coordinated.