WASHINGTON (AP) — Arizona's new senator says he'd vote to repeal the nation's health care law. That's one additional Republican ready to obliterate the statute because his predecessor, the late Sen. John McCain, helped derail the party's drive with his fabled thumbs-down vote last year.

It could well be too little, too late.

After years of trying to demolish former President Barack Obama's prized law, GOP leaders still lack the votes to succeed. Along with the law's growing popularity and easing premium increases, that's left top Republicans showing no appetite to quickly refight the repeal ba...