Courtesy of the new issue of The Forum (gated, alas):
The Disappearing—but Still Important—Swing Voter
Mayer, William G.
Incumbent and Party Vulnerabilities in the House of Representatives
Lin, Jing / Stonecash, Jeff M.
Political Ideology in American Politics: One, Two, or None?
Carmines, Edward G. / Ensley, Michael J. / Wagner, Michael W.
Independent Leaners as Policy Partisans: An Examination of Party Identification and Policy Views
Magleby, David B. / Nelson, Candice
Independent Leaners: Ideals, Myths, and Reality
Norpoth, Helmut / Velez, Yamil
Polarization and the Fiscal Future of the United States