(S (S (NP (BASENP (DT The) (NN four) (JJ liberal-leaning) (NNS justices)) (PRN (LRB -LRB-) (NP (NP (NP (BASENP (NNP Stevens)) (COMMA ,) (BASENP (NNP Souter))) (COMMA ,) (BASENP (NNP Ginsburg))) (CC and) (BASENP (NNP Breyer))) (RRB -RRB-))) (VP (VBD joined) (NP (BASENP (NNP Kennedy)) (COMMA ,) (NP (BASENP (DT a) (NN moderate)) (SBAR (WHNP (WP who)) (S (VP (ADVP (RB often)) (VP (VP (VBZ casts) (BASENP (DT the) (JJ deciding) (NN vote))) (PP (IN in) (BASENP (JJ close) (NNS cases))))))))))) (PERIOD .))