The 2012 presidential campaign has become a dog-eat-dog contest. For months, Obama campaign operatives sought to make an issue of Mitt Romney carrying his Irish setter Seamus in a rooftop dog carrier during a family vacation in 1983. Some major media outlets picked up the non-story, and the Obama campaign buttressed it with an endless series of snarky tweets and barbs. The liberals are chasing their tails with this tale.On Tuesday, the Daily Caller’s Jim Treacher juxtaposed the Seamus story with a passage from President Obama’s book “Dreams From My Father: A Story of Race and Inheritance,” in which he...