(S (S (S (S (BASENP (DT A) (NN candidate)) (VP (MD must) (VP (VB win) (NP (QP (ADVP (IN at) (JJS least)) (PDT half)) (BASENP (DT the) (NN vote)))))) (SBAR (SBAR (IN in) (NN order)) (S (VP (TO to) (VP (VB avoid) (BASENP (DT a) (JJ run-off) (NN election))))))) (SBAR (IN if) (S (BASENP (DT the) (NN turnout)) (VP (VBZ is) (BASENP (QP (RB over) (NN 50)) (NN %)))))) (PERIOD .))