Once the Sept. 25 deadline for him to go to court to remove his name passes, analysts said he should expect Democrats to unload attacks on some of his other statements.

“I think in the Valley of Death during the Crimean War, the Russian guns kind of waited for the British to rush, and I think that’s what you’re hearing now, a lot of silence on the battlements,” said University of Missouri political science professor David Robertson, referring to the famous Battle of Balaclava that left nearly half the British troops wounded or dead.

But Mr. Akin’s campaign hopes the deadline will bring good news in the form of new allies who decide they cannot pass up a chance to unseat a Democrat.