(S (S (BASENP (NNP Cahill)) (VP (VBZ says) (SBAR (S (BASENP (PRP they)) (VP (VP (VBP view) (BASENP (NNP Santorum))) (PP (IN as) (NP (ADVP (RB mostly)) (NP (BASENP (DT a) (JJ dirty) (NN joke) (POS 's)) (NN punchline))))))))) (PERIOD .))