Thirty percent cite, among other reasons, "his support for education."
But this year, 18 percent cited cities, he said, and that was up from 13 percent two years ago.
Another 11 percent cited no reason for their opposition.
Only 2 percent cited what they see in ads.
Some 14 percent said the government should be most responsible, and less than 1 percent cited their children.
Only 1 percent of those who said they were going to spend less on Christmas this year cited the stock market's plunge.
In the survey, 64 percent of the respondents cited that reason.
Thirty-four percent cited lack of money or the need to work as the reason.
In 1987, 25 percent said weight and 41 percent cited health reasons.
Ninety percent cited the lack of liberties as the main reason for leaving, he said.