(S (S (NP (NP (BASENP (DT A) (QT (DQL ``) (JJ critical) (DQR '')) (NN campaign) (NN ad)) (PRN (COMMA ,) (VP (VBN launched) (PP (IN by) (BASENP (DT the) (NNP US) (NNP Republican) (NNP Party)))) (COMMA ,))) (SBAR (WHNP (WDT that)) (S (VP (VP (VBD took) (BASENP (DT a) (NN swipe))) (PP (IN at) (BASENP (NNP Canada))))))) (VP (VBZ has) (VP (VBN been) (VP (VBN pulled))))) (PERIOD .))