数据源 来自data/1976-2020-president.csv data/1976-2020-president.csv data/1976-2020-president.csv 来自data/1976-2020-senate.csv data/1976-2020-senate.csv data/1976-2020-senate.csv 来自data/538pollster_ratings.csv , data/generic_ballot_polls.csv , data/governor_polls.csv , data/house_polls.csv , data/president_polls.csv和data/senate_polls.csv 来自data/538_raw_polls.csv 来自data/lls_auxiliary_dataset.tsv和data