Taylor disliked Scott so much that if the latter won the nomination, Taylor might run as an independent--which would help assure a Cass victory. "Taylor's personal animosity toward Scott was widely known among Whig leaders, and many dismissed as fantasy the assumption that Scott would inherit Taylor's support. No nomination, they argued accurately, was more likely to spur a vengeful Taylor into an independent candidacy than that of Scott, and if Taylor remained in the race, realistic Whigs understood, the Whigs could not win." Michael F. Holt, *The Rise and Fall of the American Whig Party,* p. 318.
http://books.google.com/books?id=5aGyVFn3VnMC&pg=PA318