Do Feingold, Warren assume they win an election before then? A former Senator seems unlikely, but a failed one-time Senate candidate seems very unlikely.
I think that Warren is very likely to win - but yes, I wouldn't expect her to be a player if she lost.
Feingold barely made the list - but liberal posters on this forum mention his name all the time. I don't expect him to run for anything, especially not the Presidency, but apparently many people do.
Feingold is wishful thinking, I think he is done, if he took down Walker in a recall he would be be trading above Warren.