@article {Stone2007, title = {Candidate Valence and Ideological Positioning in the 2006 House Elections}, journal = {American Journal Political Science}, volume = {12}, number = {2}, year = {2007}, pages = {371{\textendash}388}, url = {http://web.mit.edu/polisci/portl/cces/material/Stone and Simas.pdf}, author = {Stone, W.J. and Simas, E.N.} }