WASHINGTON -- Near the top of the new Democratic congressional majority's agenda is passage of federal embryonic stem cell research legislation vetoed last year by President Bush, a measure that will answer a major question. There is no doubt the new bill will pass both houses of Congress. What remains in doubt are the votes to be cast by newly elected Democrats who campaigned as pro-life advocates, particularly Sen. Bob Casey Jr. Outside the boundaries of his state of Pennsylvania, Casey is best known as the son of the Democrat most revered in the pro-life movement: the late Gov. Robert...