The provisional government had never been meant to last. It was intended to be an interim government. The Constituent Assembly was the ultimate dream as it would be the first fully elected democratic Russian government.
The Provisional Government was always open to the charge that as an unelected, self appointed body it had no right to exercise the authority that probably would belong to the Constituent Assembly.
The scope of the PG for action was limited because real power was held by the Soviet
Other revolutionary parties had accepted the February revolution as a genuine revolution so it made sense for them to co-operate with the Provisional Government. Supposed revolutionary parties were prepared to enter into coalition with the Kadets, the dominant party in the government, and await the convening of the Constituent Assembly. This gave the Bolsheviks a powerful propaganda weapon which Lenin exploited. He charged the other revolutionary parties with having sold out to the middle class bourgeoisie.
The other parties were weakened in their support for the war. None of them opposed the war with the consistency of Lenin’s Bolsheviks.
Mensheviks saw the February Revolution as marking a critical stage in the class war, when the bourgeois (middle) had overthrown the old feudal (upper) class. This, as Marx had stated, was necessary before the proletariat (workers) could take power. However the Mensheviks believed the Russia did not have a proletariat capable of revolution and should wait before attempting one.
Bolsheviks were the only party opposed to continuing the war
Bolsheviks won support of the peasants with their land policy
Radical policies were in tune with the workers and soldiers aspirations – “Peace, Bread, Land”
Lenin was a strong leader who had been planning for revolution – “What is to be Done?”
Lenin persuaded the Bolsheviks to act before the Constituent Assembly elections and before the opening of the Second Congress of Soviets. On 10th October he persuaded the Central Committee that the time was right to seize power
In September Trotsky was elected Chairman of the Petrograd Soviet.
By September the Bolsheviks had control of the Petrograd Soviet as well as the Moscow Soviet
Trotsky persuaded the Soviet to set up the Military Revolutionary Committee to plan the revolution