The controversy over stem cell research is front and center again.
The Senate began debating a bill that would roll back the government's five year old ban, with supporters hoping to get enough votes to override a veto from President Bush, the only bill the president has ever vetoed.
"This bill will allow researchers to kill embryos and pay for that killing with American taxpayers' dollars," said Senator Chuck Grassley (R), Iowa.
"Take the handcuffs off, so they can now begin to do the research that will lead to miraculous cures," said Senator Tom Harkin (D), Iowa.
The bill would allow scientists to use frozen embryos left over from In vitro fertilization, but there is an alternate bill under discussion that claims to avoid the ethical issue by limiting stem cell research to just embryos that died naturally.