The National Portrait Gallery reopened last July 4 after being closed for six years for renovations. One of its central collections is of portraits of the Presidents, ranging from the standard stately depictions to drawings by Herblock and whimsical, biting sculptures by Patrick Oliphant. (His statuette of Richard Nixon shows Mr. Nixon riding a horse, hunched over, with his hand behind his back in the Napoleonic manner.)
The gallery, like most cultural institutions, has its hand out, in a nice way, to prospective donors. (Admission is free, because it's part of the Smithsonian Institution, though it's several blocks north of the Mall.) One way to support the gallery is to "adopt a portrait." If you adopt a painting by making a gift of a certain size, the gallery will invite you to special events, offer you private tours, and, most visibly, place a small plaque above the description of your adopted portrait identifying you as its adoptive parent.
The gallery includes a striking portrait of John Kennedy, done by Elaine de Kooning. It's one of the few paintings that has been adopted. A small plaque identifies the generous donors as Walter and Joan Mondale. So far no one's adopted Ronald Reagan or Bill Clinton.