The Fact of the matter is that the US Senate has no legal standing not to seat a member if said member has been certified by the State's Sec. of State.
This is why Mr. Franken has not been seated. He has yet to be certified by the Minnesota Sec. of State.
When either Mr. Franken or Mr. Coleman receive said certification the "high and mighty, grand pooba Harry Reid will have no legal standing to "not seat" that person.
This is exactly why Senator Burris was denied his seat originally. He had not yet been certified by the Illinois Sec.of State.
When he received said certification he was seated..as the US Senate was legally bound to do.
Rats have twice not seated certified winners (NH senate race and Indianna house race). I am not sure why the Minnesota situation is different. The Senate is not guided by state law. Coleman will never be seated. I am not sure if Republicans can stop the seating of Franken if Coleman is certified as the winner.