The "secret garden of politics", where some win and others lose their candidate selection bids, and why some aspirant candidates are successful while others fail have been enduring puzzles within political science. This book solves this puzzle by proposing and applying a universally applicable multistage approach to discover the relationship between selection rules, selectors’ biases, aspirants’ attributes, and selection outcomes.

Rare party and survey data on winning and losing candidates and insider views on what it takes to win a selection contest at multiple selection...