Balloon-Juice: Frist throw in the Towel: "Hardly surprising, considering the hammering he took over his departure on stem cell research. Plus, of course, science is hard work and fraught with peril. Why, all those years of medical training and Frist still misdiagnosed Terri Schiavo....read on"
He could only stay out of the circus for only so long. As a musician, when you get home from playing on the road in front of large audiences a mild depression sets in for a while. The energy and excitement that a person experiences is incredible and you long to go back out there and perform again. Obviously the same thing has happened to Frist.