Possible Clues:

• Comic strip character, duck, backing America
• "Peanuts" thumb-sucker
• Second pope, following St. Peter
• Comics character who said 'Big sisters are the crab grass in the lawn of life'
• 'Peanuts' kid with a blanket
• Blanket-toting toon
• Blanket-toting "Peanuts" character
• Charlie Brown's best friend in Charles Schulz's 'Peanuts'
• Great Pumpkin originator
• "Peanuts" boy with a blanket