  I propose an open dataset of country-level historical opinion polling data
for the European Union and the UK. The dataset aims to fill a gap in available
opinion polling data for the European Union. Some existing datasets are
restricted to the past five years, limiting research opportunities. At the same
time, some larger proprietary datasets exist but are available only in a visual
preprocessed time series format. Finally, while other large datasets for
individual countries might exist, these could be inaccessible due to language
barriers. The data was gathered from Wikipedia, and preprocessed using the
pandas library. Both the raw and the preprocessed data are in the .csv format.
I hope that given the recent advances in LLMs and deep learning in general,
this large dataset will enable researchers to uncover complex interactions
between multimodal data (news articles, economic indicators, social media) and
voting behavior. The raw data, the preprocessed data, and the preprocessing
scripts are available on GitHub.
