I'm guessing she'll be using it as a stepping stone to run for Senate in 2016 (or 2018 if Nelson retires)?
A single term in Congress is hardly a stepping stone, especially after she's already known statewide.
I'd also prefer someone younger run for Senate in 2016/2018. Someone like Patrick Murphy, Alvin Brown, or Gwen Graham (If she defeats Southerland)
Just seems odd someone who came 1% away from being governor would be comfortable taking such a huge step down without aspirations for a higher office.