Mind, I am writing this as a german so have lengthly had to go through with his rise to power more than once during school.. after four or five consecutive classes with this subject, everything probably looks like nazis taking over ..
Problem was that George Lucas tried to put modern politics into the fall of the senate. To be piratical it is hard to determine when Rome moved from Republic ruled by a congregation to an Empire ruled by a Monarch. If Lucas made the story closer to the Roman story and not try to make GWB is a Militant overlord helbent on destroying democracy through hidden means it could have been a better story.
Lucas has a great talent for settings and design. But his plot and stories are just horrible.