PHILADELPHIA (AP) _ Laura Bush, in a warm convention testimonial, told Republican delegates and the nation Monday that her husband's values won't waver ``with the winds of polls or politics.''

Mrs. Bush, once wary of George W. Bush's leap into presidential politics, embraced the prime-time leadoff slot at the Republican National Convention.

America, she said, wants a president who reflects ``its heart and its values and its leadership in the world,'' Mrs. Bush said. ``They will be looking for someone to uphold that high honor and that trust.''

She said Bush would fulfill that role.

``He shares credit and doesn't pass blame,'' she said in remarks prepared for delivery. ``He sets a tone that's positive and constructive, a tone that is very different from the bitterness and division that too often characterizes Washington, D.C.''