Here are several sources to aid in your search for Pro/Con Arguments. The list below is in addition to the databases listed under the Finding Resources tab - located on the left side of the page.
ProCon.org - An independent 501(c)(3) non-profit public charity with no government affiliations of any kind. Their mission statement is: "Promoting critical thinking, education, and informed citizenship by presenting controversial issues in a straightforward, nonpartisan, primarily pro-con format."
Public Agenda Online - Founded in 1975, this non-profit organization provides non-partisan research reports and pubic engagement on divisive issues.
Public Opinion Polls and Surveys:
Pew Research Center - A nonpartisan think tank that conducts public opinion polling, demographic research, content analysis and other other data-driven social science research. Their mission is to enrich the public dialogue and support sound decision-making.
Roper Center for Public Opinion Research - Located at Cornell University, the center holds archives of public opinion surveys dating back to the 1930s. To search their holdings, click on the 'Search iPoll' link. This site has video tutorials as well; hover over 'Support', then choose 'Video Tutorials'.
GovInfo - Select 'Browse by A to Z'. Next click on the letter 'C' to find "Congressional Hearings, 104th Congress (1995-1996) to Present" in the list.
OneSearch - Search the library's resources by entering relevant keywords, such as 'congress and hearing and immigration.' Results will include both recent and older hearings. Limit results by date on the left side of the webpage.