Architecture: 1850s-1890s. 1850s. James Buchanan, at the urging of his niece and White House hostess Harriet Lane, added a wooden greenhouse on the roof of the west terrace in 1857, adjacent to the State Dining Room. One could enter a private world of plants and flowers grown for decorating the house.
A caucus is a meeting of supporters or members of a specific political party or movement. The term originated in the United States, but has spread to Australia, Canada, New Zealand, South Africa, Brazil and Nepal.
In U.S. primary elections, registered members of a political party select their party's nominees to run in the general election each November. Some states hold open primaries in which all registered voters may participate, but others have closed primaries, in which only registered party members may participate.airVote.org reported in 2008 that six states --- Alaska, Iowa, Kansas, Maine, Nevada and Wyoming --- operate closed caucuses instead of primary elections. A caucus is a meeting in which party members select nominees for elected office.