Which presidential campaign slogan reportedly cost over $3 million to develop through extensive market research and testing before its official launch?

Campaign slogans can make or break political movements. These carefully crafted phrases become rallying cries that embody a candidate's vision and resonate with voters. Some political slogans have become so iconic that they've transcended their campaigns to become permanent fixtures in our cultural lexicon. Test your knowledge of the most expensive political slogan development in recent history!

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Make America Great Again (Trump, 2016)
Change We Can Believe In (Obama, 2008)
Stronger Together (Clinton, 2016)
Country First (McCain, 2008)