The letter criticized the player's dreadlocks, which the author, who signed his name as Dave Petersen, called "disgusting" and "certainly not attractive."
Clifford passed for 264 yards and scored four total touchdowns in Penn State's 35-7 victory over Purdue on Saturday afternoon.
From Michael Scott to Randy Jackson to the quintessential Michigan fan meme, only GIFs could properly summarize Wolverine fans' reactions to a primetime White Out.
A White Out under the lights, just like God intended.
Penn State will play the White Out at night for the fourth consecutive season.
Brandon Polk had a career day for James Madison in a win over Stony Brook, while two other former Penn State players made their season debuts.