Obama as an Usurper is not entitled to a trial in the Senate. He is an Usurper, not a sitting president.
You say Obama is an usurper, and I agree, but my opinion doesn't count for much. The opinion of the people we put in place to administer due process is what matters and they have not yet spoken. When they do speak I hope they will get the order of trial and punishment right.
The facts have to be established by SOME formal trial procedure. The putative Executive Branch cannot be tried by the Judiciary, even though Hussein is in all likelihood a fake ass counterfeit usurper. The FACT of it must be established using the only constitutional method to remove a POTUS, the Article I Sec. 3 impeachment process, and or the XX amendment.
None of this changes the fact that I would enjoy dragging him from the Oval Office by his big jug ears.