Rob Portman -- who's played the roles of Hillary Clinton, Al Gore, Joe Lieberman, and Barack Obama in GOP debate prep-- has one particular favorite.
Of all the Democrats he has studied, Portman said that Edwards was the easiest to pull off.
"He's predictable," said Portman of the 2004 Democratic vice presidential nominee. "Real predictable."
Another great anecdote from Chris Moody's piece has Joe Lieberman claiming that Portman's become something of an an "alter ego" of his.
"He does a little bit of an impersonation of me that's a bit eerie," said Joe Lieberman, whom Portman portrayed in vice presidential debate practice with Dick Cheney in 2000.
"I've tried on occasion when I couldn't make it to a speaking engagement to send Rob Portman," he joked. "I feel like he's become sort of an alter ego."