These six sedans are the fleshy part of the American car market. Big-name D-segment sedans sell like crazy, and pretty much made Honda and Toyota what they are today. Their dominance of this segment, often called “Camccord” after their two best-sellers, remains unchecked as each has spent three months on top of the chart. But there’s danger down below. Hyundai’s Sonata has been making steady progress all year (June excepted), and the Malibu has enjoyed more modest, but equally steady growth. Altima all but matched Camry in February, and gave Accord a scare in March. There’s still a tight pack of four nipping at the heels of the big dogs. Time to start coming up with a new nickname for the D-Segment?