Lucky me... I just happen to have a younger sister who does stem cell research in Atlanta. Here's the low-down that I got from her. The existing lines are limited only in the sense that there is not an unlimited supply, not because there are too few. In the 2.5 years she's been working with them, she and her group have only worked with one strain. She said that working with more strains at the same time really trashes the consistency of results. so there really isn't a need for a ton of new strains - at least until they get some feeling of what can be done with stem cells, which is right now one step above nothing.
This is why private investors are not sinking much money into this effort. She said they spend billions of dollars in AIDS cures, but next to nothing in stem cells because "the science isn't there." There's nothing but theories and conjecture, and there's a very good chance that all of the reserach will come to nothing. That's why there's a huge push for the government to pay for the research. If the money ends up being wasted, it's "The Government's" money.
Here's what we really got a chuckle out of. The lack of government funding is forcing the dreaded PHARMACEUTICAL INDUSTRY and BIG DRUG COMPANIES to pay for the research. If the government does as the Dems want, and pays for the research, they'll be giving a windfall to those oh-so-nasty drug people. Makes you wonder who's pocket the drug companies are really in.