C'mon. Blocking the Senate doors? Please. He'll demonize the Jedi, so they'll become criminals. He'll probably say the council tried to kill him, after the Mace/Ani scene. Most people don't like or trust them already. Ani "saved" him so he'll become a big hero. Palp will then use his strong leadership rep to get elected Emperor and the Senate will hand him, willingly, the keys to the Republic. That's the beauty of his plan. The Jedi have to watch the galaxy hand control over to the Sith, and they're happy to do it. Meanwhile, everyone now hates the Jedi for "overstepping" their bounds. It's a beautiful plan. deliciously evil. That's how evil people seize governments, by seizing their hearts and minds. Hitler didn't take power over the German government by force. The people handed Germany to him and they did it willingly because he earned their trust because he was smart and a strong leader. Then he got everyone to believe all non-Germans were bad, thus the deaths of many Jews, foreigners and gypsies (in the SW Universe--the Jedi). And everyone gladly jumped on the genocidal band wagon. And that's ten times scarier than taking a place by force.
I'm not sure he'll make an announcement "revealing" himself as Darth Sideous. He may announce that he is now Emperor, but he won't get rid of the senate until the beginning of ANH. We know that it goes from the congress of the republic, called the senate and in Ep4, it's called the Imperial Senate. BUT, General Tagge asks how the Emperor will maintain control without the beauracracy, which emplies that the members are still elected by the people of their planets....even if the elections are rigged.
exactly. its not as if he'll just walk into the Senate and say "oh, by the way, my name is actually Darth Sidious Dark Lord of the Sith, and I'll be your emperor from here on out, have a nice day." he's got to do it slowly, he has to get the people on his side or run the risk of a full all out rebellion from EVERYONE not to mention opening the door for assasination attempts (and they would only be attempts with him). He's already got the people eating out of his hand. He fronts like he's reluctant to have an army, but he must because he must be strong for all the little people in the galaxy and a bunch of other bull and the people eat it up. Kinda like a current world leader who resides in my country...hmmm...wierd.