The Huntington Library, in San Marino, has long been known for its extraordinary holdings, including tremendously broad and deep collections in American history. Now through the end of August, the Huntington offers what may be the largest gathering of Lincoln material ever seen in one place. Titled “The Last Best Hope of Earth,” the show concentrates strongly on Civil War material but also offers personal memorabilia, including the President’s marriage license and the white gloves he wore to the theater on the night of his assassination. The curators hope the public will draw from this assemblage of two hundred items the message that this is still Lincoln’s America, still the last best hope.