sentence = [('Andrew', 'NNP', 'PERSON'), ('is', 'VBZ', 'O'), ('part', 'NN',
    'O'), ('of', 'IN', 'O'), ('the', 'DT', 'O'), ('Republican', 'NNP',
    'ORGANIZATION'), ('Party', 'NNP', 'ORGANIZATION'), ('in', 'IN', 'O'), (
    'Dallas', 'NNP', 'LOCATION')]
Chunking Stanford Named Entity Recognizer (NER) outputs from NLTK format