Pew Research Center for People and the Press. November 5, 2003.
This Pew Center poll studying the mood of voters in upcoming national elections suggests that the sense of national unity that followed the Sept. 11 attacks has subsided. The survey finds a rise in political polarity, similar to public sentiment found in the center's 2000 poll. In fact, a year before the presidential election, American voters are once again seeing things largely through partisan eyes. The Republican Party has made significant gains in party affiliation over the past four years, but this remains a country that is almost evenly divided politically yet further apart than ever in its political values.
The Pew Research Center's longitudinal measures of basic political, economic and social values, which date back to 1987, show that political polarization is now as great as it was prior to the 1994 midterm elections that ended four decades of Democratic control in Congress.
http://people-press.org/reports/pdf/196.pdf [pdf format, 152 pages]