http://story.news.yahoo.com/fc?cid=34&tmpl=fc&in=World&cat=Gays_and_Lesbians
By a margin of 55 to 41 percent [LA Times Poll], those polled agreed with the statement that "if gays are allowed to marry, the institution of marriage will be degraded."
About half favored a U.S. constitutional amendment defining marriage as the union between a man and a woman, while 42 percent opposed it, according to the poll published Saturday on the newspaper's Web site.
The telephone poll of 1,616 adults around the country was conducted from March 27-30. The margin of error was plus or minus 3 percentage points.
These polls are a bit dated, but they're useful for trend lines.
http://www.pollingreport.com/civil.htm
"Do you strongly favor, favor, oppose, or strongly oppose allowing gays and lesbians to marry legally?"
Favor Oppose Don't Know
(3/04) 32 59 9
(2/04) 30 63 7
(11/03) 30 62 8
(10/03) 30 58 12
"Do you strongly favor, favor, oppose, or strongly oppose allowing gay and lesbian couples to enter into legal agreements with each other that would give them many of the same rights as married couples?"
Favor Oppose Don't Know
(3/04) 49 44 7
(10/03) 45 47 8
"Which comes closest to your view? Gay couples should be allowed to legally marry. OR, Gay couples should be allowed to form civil unions but not legally marry. OR There should be no legal recognition of a gay couple's relationship."
Marriage CU's Nothing Don't Know
ALL 22 33 40 5
Republicans 10 31 56 3
Democrats 28 31 35 6
Independents 26 36 31 7
"Do you think marriages between homosexuals should or should not be recognized by the law as valid, with the same rights as traditional marriages?"
Valid Not Valid No Opinion
(3/5-7/04) 33 61 6
(2/16-17/04) 32 64 4
(2/6-8/04) 36 59 5
(12/03) 31 65 4
(10/03) 35 61 4
(6/03) 39 55 6
(1/00) 34 62 4
(2/99) 35 62 3
(3/96) 27 68 5