The Clerk of the U.S. House of Representatives has released q list of candidates for U.S. Senate and U.S. House who are on the ballot. See it here.
The Clerk says the information is from official sources. Yet the Clerk’s book sometimes slightly deviates from official state sources on the matter of ballot labels. For example, in California’s Sixth District, Kevin Kiley is listed in the book as “independent”, whereas the ballot lists him as “Party preference: none.” Also, the book lists Dan J. Sullivan of Alaska as “Republican”, yet he is on the ballot with no party label. Thanks to Thomas Jones for the news about the book.