Interesting scenario... How would it happen though?
POD #1: Kerensky's gov't survives.
POD #2: First Red Scare, without the USSR, doesn't occur. Communism enters mainstream thought in the west, especially during the depression. Not sure what happens from this point on, how this results in commies actually coming to power, but you get the idea.
http://en.wikipedia.org/wiki/Back_in_the_USSA
Check that out...
Also, I see the USA, or USSA as it could be named would either make The communist movement/Revolution stronger And lead to a communist socialist world. Or it follows the same path as the Soviet Union did in OTL.
I see a Capitalist/Dictatorships in the East and an almost completely Communist Americas.. Several events could be interesting, such as WWII, an Anglo-American war in Canada, & how Asia would develop.
The USA is in a rather different position in multiple respects than the USSR, Communist or not - similarly, Russia is in a different position than the USA.
I don't think you're going to get a mirror image of OTL, in other words.