Byron York's look at the GOP field going into Iowa repeats a theme of Instapundit - time for new blood.
Supporters aren't locked into their past decisions.
But the world has changed; issues have changed and new candidates have emerged. Moderates who backed Romney now have Jeb Bush and Chris Christie to consider, while conservatives who backed Huckabee and Santorum have Ted Cruz and Ben Carson. Even if the veterans run again, they won't be able to recreate what they had before. They'll have to do something different.