(S (S (NP (BASENP (NNP Lieberman)) (PRN (COMMA ,) (SBAR (WHNP (WP who)) (S (VP (VBD was) (NP (BASENP (DT the) (JJ Democratic) (NN vice) (JJ presidential) (NN candidate)) (PP (IN in) (BASENP (DT the) (NN 2000) (JJ presidential) (NN election))))))) (COMMA ,))) (VP (VBZ has) (VP (VBN been) (NP (BASENP (NN one)) (PP (IN of) (NP (NP (NP (BASENP (JJ Republican) (NN party) (NN candidate)) (COMMA ,) (BASENP (NNP John) (NNP McCain))) (POS 's)) (COMMA ,) (BASENP (JJS staunchest) (NNS supporters)))))))) (PERIOD .))