Graham, maybe Cochran (if he runs for reelection and gets a strong primary challenge, he could be in trouble), and maybe Chambliss if Price runs against him (I read that Gingrey has quietly made it known that he isn't going to run and even if Price runs, Chambliss would still be favored). I suspect that most of the damage done by the tea-party this cycle will be done by making the party behave in a highly obstructionist manner and causing the party to nominate weaker candidates for Democratic Senate seats.
I have a shocking confession to make about Tom Price. Two years ago I was invited to sit in the President's box at the UGA homecoming game. I was at the buffet and I ran into Tom Price, and being the assertive kinda guy I am I approached him and asked what had happened to the Republican party. He told me he wasn't concerned with sideshow social issues and obstructionism, he only cared about fixing the economy and shrinking the size of government. I was impressed so I liked his page on Facebook a few days later. I just got around to unliking it, as his political grandstanding is exactly the kind of thing he told me he wasn't interested in. He's obviously preparing for a 2014 challenge to Saxby and I hope that if he's successful, the voters won't be fooled like I was. He's a fraud, and his district really isn't as conservative as he thinks it is. I hope his demise comes quickly.