Watch the top twelve 2007 NASCAR tell Dave Letterman the "Top Twelve Reasons I Love Racing."
Jimmie Johnson is used to firsts, including being the first (and only) driver to win the Daytona 500, Brickyard 400, the Aaron's 499 and the Championship, which he did last year.
Jimmy was able to acheive his a second Sprint Cup Championship in a row at Homestead on November 17, 2007.