Wow. Good for you @atrupar, who tweeted:
Nate, #Trump almost murdered #Biden during a #debate last cycle by rolling up on the stage as a biological weapon. Norms and traditions went out the window long ago.
Nate Silver:
You're supposed to be the candidate who stands up for norms and traditions and now you're ducking this tradition?
"The President will not be participating in the Commission of Presidential Debates' announced debates."