Mercury Morris

TMZ Sports asked Mercury Morris -- the mouthpiece of the '72 Miami Dolphins -- how he felt about the Carolina Panthers making a run at an undefeated season. His response: "Go ask the Patriots how difficult it is to do it and how they feel about some little kid in Guatemala wearing those perfect…

Miami Dolphins legend Mercury Morris ain't a fan of the N-word -- as in, Nixon ... Richard Nixon. The unofficial mouthpiece for the undefeated '72 Super Bowl champs arrived in D.C. this week ... and told TMZ he’s glad his victory trip to the White House is coming 40 years after the fact -- so he…