Russ Feingold could beat her. I don't know that anybody else could.
I agree Feingold would be her strongest opponent but she'd still be a heavy favorite and he'd be a heavy favorite for his old senate seat. I assume he'll opt for the latter race, especially with Republicans winning seats if not control of the senate in a couple months.
I'd agree with you but it looks like Ron Kind is going to challenge Johnson in 2016 in Wisconsin. Feingold and Kind are kindred spirits so I doubt Feingold runs for Senate again. IMHO, he's more likely to primary Clinton or challenge Walker (or Kleefisch) in 2018.
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