After a string of critical losses in the 2008 Democratic primary, Hillary Clinton’s campaign put out a hard-hitting ad that questioned Barack Obama’s readiness for the White House.
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It's 3:00 am: Political Ads That Changed the Game

The spot had echoes of Johnson’s 1964 “Daisy” ad but while Clinton did run off a string of wins in the primary following its release, it wasn’t enough to change the outcome of the race. This series of mini documentaries on ads that changed the political landscape was created in partnership with NBC News.