The Illinois governor has promised to name someone before the end of the year.
Both privilege and challenge have marked her life, and now Mrs. McCain could follow her husband to the White House.
Cindy McCain's past is the latest to be questioned after errors were found.
Its controversial deal to import US nuclear technology and fuel can now go ahead.
Abdul Sattar Edhi and Bilquis Edhi are revered for their work over the last half-century, pulling abandoned babies from the dumps and drains of this Pakistani city.