Which famous political commercial, aired only once during the 1964 presidential campaign, was so controversial and effective that it's credited with helping Lyndon B. Johnson win in a landslide?

Presidential campaigns have produced some of the most memorable and influential advertisements in American history. These commercials have shaped public perception, swayed elections, and transformed how political candidates market themselves to voters. This trivia question focuses on a groundbreaking political advertisement that fundamentally altered campaign strategy and is studied by political scientists to this day.

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The Daisy Ad (featuring a little girl counting petals on a daisy before a nuclear explosion)
Morning in America (featuring optimistic scenes of Americans starting their day)
The Bear in the Woods (featuring a metaphorical bear representing the Soviet threat)
Willie Horton Ad (focusing on a prison furlough program in Massachusetts)