[earlJam]

http://www.google.com/#hl=en&q=%22end+of+the+campaign%22+theory+of+negative+political+advertising&aq=f&aqi=&aql=&oq=&gs_rfai=&pbx=1&fp=4acc6984125e3f1c

[Mojave]

http://www.google.com/#hl=en&q=%22end+of+the+campaign
%22+theory+of+negative+political+advertising&aq=f&aqi=&aql=&

Thanks. Your link offers you no support and also brings up
http://weber.ucsd.edu/~tkousser/Wattenberg.pdf,
which demolishes your assertion. Too funny!