Hillary Clinton’s “3 a.m." advertisement (released in March) was named the “Best TV Spot” of the 2008 election, chosen by a large margin in a poll of Campaigns & Elections’ Politics magazine subscribers (many of whom are political professionals). Here are the complete results for the question in the poll:

Which of the following political advertisements would you say was the “Best TV spot” of the 2008 election?   
Hillary Clinton – “3 A.M.”    31%
Barack Obama – “The Moment”    24%
John McCain – “Celebrity”    11%
Mike Huckabee – “Chuck Norris Approved”    9%
Bill Richardson – “Job Interviews”    7%
Mitt Romney – “Experience Matters”    3%
Republican National Committee – “Storm”    3%
Mike Gravel – “Throws a Rock in a Lake”    1%
Other    4%
Don’t Know    6%

Clinton's ad did get a lot of attention, and may have helped her win many primaries after it was released—as well as spawning a multitude of parodies on YouTube. Here is the original ad: