Defection from the anti-cloning ranks by Sen. Jim Talent, until now a rising star in the conservative movement, reflects deep divisions in the Republican Party created by the stem cell research issue. When Talent went on the Senate floor Friday to take his name off a bill to ban human cloning, he showed how those divisions imperil his re-election to a second term in Missouri this year. Talent had been a longtime co-sponsor of Sen. Sam Brownback's anti-cloning bill. But Missouri business interests who finance the Republican Party are backing a state constitutional amendment that explicitly allows human cloning to...