Who is Anne Beckwith from The Mark of the Assassin: A Novel and what is their importance?

Wife of President Beckwith, Anne is a rather selfish greedy individual herself. Originally objecting to her husband's run for re-election, she is persuaded by Mitchell Elliott to convince her husband to run anyway. In return, Elliott uses Sam Braxton to put together real estate deals to enrich the Beckwith's, so that they may retire in style.