Which in turn will help Coleman, because if the national race keeps not being competitive, the next Republican argument will be - don't give the Democrats too much power.
When and how do you expect them to present that argument?
McCain makes that argument, not Coleman - but just as a general point, not as a specific argument.
I understand your point about Minnesota not liking the Republican party, but if Franken keeps collapsing and losing voters to Barkley, Coleman may only need 40% or so to win, which is somewhat around the Republican base in MN (it's more like 38%, but still).