The Utah senators - Hatch and Bennett - made a deal that Utah wouldn't stop shipment of the nuclear waste through Utah IF the repository was here. That is why they voted YES today for the Yucca Mountain bill.
Yes, I'm sure MANY deals were made with Senators and Congressmen but there are still many avenues of attack left for the opponents and many more transshipment states besides Utah.
Fortunately, nuclear transportation has an excellent safety record and the new generation rail and truck shipping casks will be the safest yet. The area that may become contentious is just how vulnerable such high integrity containers may be to terrorist intervention (armor piercing projectiles for example).