Before you count out Bob Corker, keep in mind that most people in the know around here have all but conceded the nomination to him because of money. Corker has already raised 3 million and this is all before he writes himself a nice fat multi-million dollar check. And as if he already didn't have an advantage, Corker also picked up Tennessee's best fundraiser, Kim Kaegi.
I do think that kind of talk is very premature as we haven't really seen a campaign yet, despite the fundraising. Bryant will throw everything, perhaps including a kitchen sink, at Corker and may very well make something stick. They're spreading a rumor that Corker is pro-choice around now and I'm getting all kinds of IM's saying "Did you know Bob Corker was pro-abortion?"
The campaign has only hardly begun and Corker hasn't spent a dime yet, so I wouldn't put too much stock into the primary polls until the respective machines get into high gear.
A lot of people think Chafee may lose in a primary, although I haven't seen any polling on this.
Ford is a longshot to win in TN against Hilleary, who strikes me as a pretty good candidate who has already run statewide. He would have a close race against Bryant, and would probably defeat Corker...mayors NEVER succeed at getting elected to Senate.
Pennsylvania has been discussed enough already.
As for Montana, Burns would be vulnerable, but I'm not sure the Dems have a good enough candidate available.