Mitt Romney can’t get past the Seamus story. In 1983, Romney put the family dog in a carrier on the roof of his Chevy as his wife, their five sons and their luggage squeezed in to the station wagon for a vacation. The dog got diarrhea. Romney has not figured out how to put the 29-year-old story behind him. So critics continue to use the episode as the defining anecdote about the GOP hopeful.