Sen. John McCain (R-Ariz.) seized on his primary rival’s shaky historical knowledge this week. On Monday, his camp released a video of former Rep. J.D. Hayworth (R-Ariz.) saying the United States didn't declare war on Nazi Germany during the Second World War, but rather, it was vice versa.

Hayworth's incorrect statement has now made its way into a vintage-looking Web video the McCain camp released Tuesday. With the primary still months away, however, this is unlikely to linger as an issue.