I'm having trouble pasting the quote I want in, but the author wrote that without Franken and TK still ill, Dems need two out of three Senate Republican moderates (Snowe, Collins and Specter) to get to 60. If he is seated, they just need one.
This prospect, understandably, gives Republicans every reason to prolong the fight for Coleman, or at least, to keep Franken out of it.
At the same time, Democrats would need to keep their own moderates from defecting. Nevertheless, the story underlines the point that 60 is the magic number.