From LC:
The Library of Congress Web Archiving Program has updated the United States Elections Web Archive to release content archived during the 2016 U.S. Elections, as well as some campaign websites from special elections in 2015 and 2017.
As with prior election releases, this release contains campaign sites archived weekly prior to the elections, documenting sites associated with presidential, congressional, and gubernatorial elections. The sites archived in this collection typically include social media channels as well, in order to provide a fuller representation of how candidates presented themselves via the Internet to the electorate.
Direct to United States Elections Web Archive (via Library of Congress)
See Also: Library of Congress Introduces “General News on the Internet” Web Archive (April 22, 2019)