Obama advised 'not to overreact' in tonight's debate

From Mike Allen's Politico Playbook, a widely-read tip sheet in Washington, D.C:

Obama is so primed for a comeback that the number one piece of advice he is getting, according to a Democrat familiar with the president's debate preparation, is "not to overreact, not to overcompensate": "You've got to take on this guy and challenge him, but you can't seem like a bully."

In essence, the anti-Biden.