(S (S (BASENP (JJ Last) (NN week)) (COMMA ,) (S (BASENP (NNP Iowa) (NNP Governor) (NNP Tom) (NNP Vilsack)) (VP (VBD announced) (SBAR (S (BASENP (PRP he)) (VP (MD would) (VP (VB seek) (BASENP (DT the) (JJ Democratic) (NN nomination))))))))) (PERIOD .))