Omkar2118/datasets huggingface dataset:
Undecided Voters in US Presidential Elections

This data contains the election polls for the 2004, 2008, 2012, and 2016 US presidential election by state including data on undecided voter proportions.

See https://github.com/bonStats/undecided-voters-us-pres-elections#readme for data description.

Introducing paper: Polling bias and undecided voter allocations: US Presidential elections, 2004 - 2016