Look, in 2003 the bill had 56 sponsors, as of March, 15, 2006 the legislation has 51 sponsors. It has never made it out of committee since 1999. There has to be a reason for that and that reason may be that the flaws are just too serious to even ammend in the eyes of many.
Since then one or tow more have signed on.
Every session supporters come and go. Some die, some leave, some retire.
The Dems who were on the bill were intimidated into not signing on again by their leadership.
Again, you make assertions and jump to conclusions that are not rooted in facts.
No, your reasoning doesn't ring true. If there were that many serious flaws in the bill it would have approximately 0 cosponsors rather than 52 (you number's off).
As it becomes more and more apparent to the Congresscats that there is great frassroots support, there will be more and more cosponsors joining. None of them are so brave as to wish to be out on a limb not supporting something that there is heavy grassroots support for. This is now becoming known to some of them and will to more later as we progress.
In fact, it's an excellent bill, one that has been more thoroughly researched from an economic standpoint than any other tax bill - by far.