Including Paul in ‘can win’ and excluding Cain is denial at best and complete lunacy at worst.
The last Gallup poll I checked, Ron Paul was known by 76% of Republicans, and Cain was known by 29% of Republicans.
The difference between 76% and 29% is the difference between can win and can’t win.
Cain is certainly a fresh face, and the Democrats do elect fresh faces. But the Republicans never elect fresh faces.