(S (S (BASENP (NNP Lieberman)) (VP (VBZ has) (VP (VBN been) (VP (ADVP (RB recently)) (VP (VBN considered) (NP (BASENP (DT a) (JJ possible) (NN candidate)) (PP (IN for) (BASENP (DT the) (JJ Republican) (NN vice) (JJ presidential) (NN seat))))))))) (PERIOD .))