If you see the political ads, you may think only Republicans David Dewhurst and Ted Cruz are running to replace retiring Senator Kay Bailey Hutchison. But there's also a run-off on the Democratic side.   There is also Democrats Grady Yarbrough and Paul Sadler vying for that nomination to lead them to Washington, D.C.  Ted Cruz is running for Senate. It's well documented that he's taking on Texas Lieutenant Governor David Dewhurst. They've been seemingly all over in their efforts to win the Republican nomination. But whoever wins on Tuesday isn't finished campaigning. He'll take on Yarbrough or Sadler to win the seat in November. According to Sadler, All of the media and all of the attention has been focused on the four Republican candidates.  While neither Yarbrough nor Sadler would likely say their punting, it could take a Hail Mary for them to score a victory in November.