Someone else seizing power besides the Bolsheviks?

Let's say the Bolsheviks never overthrow the Provisional Govt.? Does a more moderate socialist group take control? A fascist one? Can Kerensky's PG stay in power if he decides to pull out of the war after all? Or, let's say Jolly Old St. Nick is less of a dumbass? I need this for a TL I'm gonna start tonight/tomorrow, that involves Lenin moving to Hollywood and becoming an actor (just go with it).
 
The Social Revolutionaries had the most support. After the Bolsheviks overthrew the Provisional Government the S.R's won a majority of the seats so Lenin refused to allow the Duma to meet and put legislative power in the Bolshevik dominated congress of the soviets. If Lenin gives power to the Duma for any reason the Bolsheviks will relegated to a far left fringe party who will be lucky to last beyond Lenin's death.
 
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