What is the "election before the election," in which a party's voters choose its candidates for the general election?

Which headfirst sledding event, back at the Winter Olympics in 2002, is named for what an early metal sled supposedly r… In December 2001, which Houston energy company filed what was then the largest corporate bankruptcy in U.S. history? Alec Baldwin played a psychopathic ex-con in the 1990 thriller "___ Blues." Which city completes the title? At the hip joint, which thighbone joins the pelvis? Called "Curly" as a youth, which Lakota war leader was a key commander in the defeat of Custer at the Little Bighorn? Which word, borrowed from Italian music, means a smooth, uninterrupted transition from one thing to another? The lychee, a rough-shelled red fruit, originated in which country? Which 22-year-old rock star died with Ritchie Valens and the Big Bopper in a plane crash on February 3, 1959?