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1) While 70% of Americans say they oppose the war, they balk at stopping it by defunding it. Poll after poll typically has approval of defunding the war at or below 50% at best.
2) E. J. Dionne pointed out what has become conventional wisdom: The last time the Democrats stopped a war by defunding it -- Vietnam -- the Republicans pushed their Dolchstoß 2.0 "we woulda won if not for the cowardly traitor backstabbing Democrats taking away our funding!" spiel to electoral gains. (Except that they really didn't -- remember, this was 1974, the height of Watergate. They actually did well that year, picking up 49 seats in the house and three in the Senate: http://en.wikipedia.org/wiki/United_States_House_elections%2C_1974 and http://en.wikipedia.org/wiki/United_States_Senate_elections%2C_1974.)