TOPEKA, Kan. (AP) — A federal judge in Kansas has refused to block the nationwide enforcement of a Biden administration rule requiring firearms dealers to do background checks of buyers at gun shows, leaving Texas as the only state so far where a legal challenge has succeeded. U.S. District Judge Toby Crouse’s ruling this week came in a lawsuit brought by Kansas and 19 other states, three individual gun collectors and a Wichita, Kansas-based association for collectors. They sought an order preventing the Bureau of Alcohol, Tobacco, Firearms and Explosives from enforcing the rule that took effect in May through...