I'm looking for big data set which is suitable to be used for document classification task. The data set which I'm looking for should composed of the frequency of the words which exist in each document, so the main goal of the task is classifying each document to one category such as Sport, Political etc. All what I found in Internet is some small data sets, if anyone can help me to find a big data set that can be used for a such task, I will be very thankful.
Note: all the attributes values should composed of integer number which represent the frequency of word in each document.
edit: I'm looking for CSV file to use it as input for multinomial naive bayes classifier.