Related Clues:

• Nasty comment from a runner?
• Political tactic
• Unpleasant political tactic
• Adman's creation
• Spread, as finger paint
• Slur
• "A diamond is forever," to De Beers
• Campaign dirty trick
• Attack unfairly
• Bit of negative campaigning
• Ugly kind of campaign
• Campaign ugliness
• Stain or smudge
• Ad writer's output
• Staple of political dirty tricks