A lot has been said over the course of this primary about
different age groups and their voting tendencies. Exit polls are consistently reported,
but rarely analyzed, by the TV personalities who dutifully read lines from
teleprompters while standing in bizarre rooms or on ledges overlooking the news
room. The exit poll data provide a wealth of information that has generally
been ignored. Here I present analyses on the pooled exit poll results of the 27
states that are available on MSNBC’s website. Exit polls, as we all know, are not perfect, but the tremendous
sample size obtained by pooling all of the exit polls provides some assurance
that biases are minimized.
Watching the reports, one may go away with the idea that
Obama is supported by young, “naïve” voters, whereas Hilary
has the support of old, “mature” voters. I have heard otherwise rational people
suggest that Obama’s supporters, being young and unpredictable, will not show
up for the election (despite the fact that they did show up for a primary). Exit
polls provide the opportunity to test whether there are differences between the
% of votes cast for each candidate within each age group, and to see just how
big these differences are. We can see whether, as suggested, Obama’s support is
limited to the youth, or if he garnishes support from older voters as well.
Data Analysis
We aren’t merely interested in how each age group favors a
candidate. We also need to know how much of the vote each voter group makes up.
The exit polls, however, are published to highlight only the differences
between the candidates, by showing what percentage of each voter bloc the
candidates earned. To correct for this, I reverse-calculated the percentage of
the vote for each category by multiplying the percent of each voter bloc earned
by the candidate by the percent of the vote that particular voter bloc made up.
For example, 17-24 year olds made up 17% of the vote in Iowa.
Obama won 57% of that age group. So, the actual % of the vote for Obama was: 57
* .17 = 9.69%. The same rational was used to convert all of the statistics
provided by exit polls for this analysis. So, what we are looking at is how the
total vote (100%) has been made up in terms of age groups, and how these groups
have split between Hillary and Obama (votes for other
candidates were removed from the analyses).
Results
The graph of this breakdown shows the percent of votes for
Hillary in orange and the percent of votes for Obama in blue. The error
bars represent 1 standard error of the mean. The asterisks show where there are
statistically significant differences (alpha = .05) between the amount of the
vote that went for each candidate.
TPM doesn’t allow “bloggers” to insert images,
but be sure to follow the link to the Figure.
According to these analyses, Obama received a higher percentage
of the vote than Hillary among voters under the
age of 40. These voters made up almost a third (28.5%) of the primary vote.
Voters aged 40 – 64 broke evenly for Obama and Hillary
(not statistically different), and this voter bloc made up half (50.8%) of the
primary vote. Obama received a lower percentage of votes among voters who are
older than 65, and this voter bloc made up 17% of the total primary vote.
I emphasized the differences between the percent of the vote for Hillary
and Obama and how it significantly differs across age groups here.
Conclusions
Obama wins or ties among every age group except those 65 and
older. The voter groups that favor or break evenly for Obama make up 79.3% of
the primary vote, whereas the voter groups that favor or break evenly for Hillary
make up 67.5% of the vote. It is true, as suspected, that voters under 40 years
old favored Obama, and it is also true that voters over 65 years old favored Hillary.
The under-40 vote has outnumbered the over-65 vote by 11%, and seem to be the
age group that has carried Obama to his lead in the primary.
It is not for me to decide what these numbers mean for the election. I merely provide them so that we have a better description of what has taken place. As we understand what has happened, we may better understand what will happen in the future.
-stYMied
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