With the President about to make an announcement in support of a constitutional amendment to ban same-sex marriage, a just updated AEI report entitled Attitudes about Homosexuality and Gay Marriage should be of interest. Here is the abstract:
Updated for Spring 2006, this study is a compilation of public opinion polls on acceptance of homosexuality, gay marriage, civil unions, partner benefits, party identification and voting of gays, employment, and adoption. The study includes all of the latest polling data as well as important historical trends for comparative purposes.
The report is 52-pages long with numerous polling results. Assorted highlights from an earlier version of the report can be found here. The full text in pdf form of the current version can be found here.
(via Andrew Sullivan)