From Live Science:
August 12, 2008
Whether Sen. Hillary Clinton stands at the side of Sen. Barack Obama during his bid for the U.S. presidency or not, her exit from the race could give him the boost he needs, a new marketing study suggests.
The research supports an assumption often discussed by pundits: that undecided voters are likely to go with the candidate most similar to the one that drops out.
The study found that if two options vie for a consumer's or voter's preference, and a third option enters and leaves the market, the remaining option most similar to the exiting one benefits. The similar features get more attention, and consumers think, "Oh, that must be important," the researchers say.
"This is exactly what happened in the Democratic primaries this year," said researcher Akshay Rao of the University of Minnesota's Carlson School of Management. "We have Obama and Clinton going at it for months after the Republican primary has been decided. John McCain couldn't buy media attention at that time because everybody is focused on the attributes that Obama and Clinton were arguing about."
He added that by withdrawing after the primaries, Clinton left in her wake an impression that the shared Obama-Clinton attributes and issue stances were important. With Clinton out of the picture, Obama could take all of that popular appeal.
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http://www.livescience.com/culture/080812-hillary-effect.html