On April 24, 1980, John B. Anderson declared that he would seek the presidency as an independent candidate. He subsequently placed his name on the ballot in all 50 states in November, even though he had already had his name on the ballot, or was about to have his name on the ballot, in two-thirds of the Republican presidential primaries of 1980.
This anniversary, exactly 32 years ago today, shows that candidates can enter the general election for president relatively late in the season, and can get on the ballot in all states. When Anderson declared, the case law regarding deadlines for independent presidential petitions was not nearly as good as it is today.