Firehose: http://www.brightplanet.com/2013/06/twitter-firehose-vs-twitter-api-whats-the-difference-and-why-should-you-care/

Phrases: http://fivethirtyeight.com/features/these-are-the-phrases-each-gop-candidate-repeats-most/

Scrapy Document: http://scrapy-chs.readthedocs.org/zh_CN/0.24/intro/tutorial.html

Twitter Scrapy code: https://github.com/zaycev/cbg-scrapy

PySpark tutorial: https://github.com/jadianes/spark-py-notebooks

AP Election Buzz: http://elections.ap.org/buzz

Twitter sentiment analysis by StanfordNLP: https://github.com/vspiewak/twitter-sentiment-analysis

Presendential sentiment analysis by NaiveBayesClassifier: https://github.com/dhruvrajan/presidential-candidate-analysis