(S (S (SBAR (WHADVP (WRB Though)) (S (BASENP (PRP he)) (VP (VBD participated) (PP (IN in) (BASENP (NN two) (JJ early) (NNP Republican) (NNS debates)))))) (COMMA ,) (S (BASENP (NNP Johnson)) (VP (VBD was) (VP (VP (VBN barred) (PP (IN from) (BASENP (JJS most)))) (PP (IN due) (PP (TO to) (BASENP (JJ low) (NN poll) (NNS numbers)))))))) (PERIOD .))