[Superman]

Those may be the two actual reasons. On the other hand, those may only be the "stated" reasons. You see, one of the overall problems with federal legislation is that the title of a bill does nothing to control its content. In many states, including mine, the title of a bill boxes its subject matter. If a bill is entitled "A bill relating to the increase of the XXXX tax from $25 to $50," then the only thing that the bill can accomplish is to raise that particular tax to $50. With federal legislation, that bill could also award $50 billion in highway funds to the State of Texas. And it is common for good legislation to get held up because someone is craving pork.