(S (S (NP (BASENP (NNP Senator) (NNP Arlen) (NNP Specter)) (PRN (LRB -LRB-) (BASENP (NNP R-PA)) (RRB -RRB-))) (VP (VBD said) (SBAR (S (BASENP (PRP he)) (VP (VBZ is) (ADJP (JJ unsure) (SBAR (IN whether) (S (BASENP (PRP he)) (VP (MD would) (VP (VB vote) (PP (IN for) (BASENP (PRPD his) (NN confirmation))))))))))))) (PERIOD .))