WASHINGTON (CNN) – Bump into John McCain in a Capitol hallway these days, and you’re lucky if you get anything beyond a polite hello. Ask him a question on any policy or political issue, and he will almost always decline comment, and keep moving. But the former Republican presidential nominee is not planning to keep a low profile for long. CNN has learned that McCain may get seats on an unusually high number of key Senate committees, so that he can engage on a wide range of high-profile issues before Congress, and his formal rival in the White House. “He...