Gallup only started recording before and after shots in 1984 though.
http://www.nationalreview.com/corner/438612/donald-trump-republican-convention-was-failure
However Hillary was shown to be rather polarising. Her Don't Know pile was small with the difference made up by No votes.
http://www.gallup.com/poll/194084/americans-positive-democratic-gop-convention.aspx
http://www.nationalreview.com/corner/438612/donald-trump-republican-convention-was-failure
Gallups numbers are truly stunning. American political conventions have been a guaranteed boost to candidates public image. Gallup has measured an increased willingness to vote for a partys candidate ranging from Mitt Romneys modest two-point bump in 2012 to Bill Clintons massive 45-point rocket in 1992. No candidate has ever come out of a convention with the public less likely to vote for him. Until now.
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However Hillary was shown to be rather polarising. Her Don't Know pile was small with the difference made up by No votes.
http://www.gallup.com/poll/194084/americans-positive-democratic-gop-convention.aspx
Since 1984, an average of 45% of Americans have said they are more likely to vote for a party's presidential candidate after the party's convention; thus, the Democratic Party's 2016 convention is right at the historical norm. At the same time, the 41% of Americans who say they are less likely to vote for Clinton after the party's convention is among the highest Gallup has measured, while the 14% who said the convention made no difference in their vote or who had no opinion is historically low.