Possible Clues:

• They come from Mars
• Button-shaped candies
• Classic colorful candies
• New confection of 1941
• Mars products, or what you'll find in 16-, 33-, 40- or 59-Across?
• Candy eaten in handfuls
• Colorful handful
• Treat from Mars
• Candy subject to a 2002 vote
• Product from Mars