A look back at US political conventions that have encompassed a wide spectrum of ideologies.
• 1830: The first national political convention is convened in Philadelphia by the Anti-Masonic Party.
• 1831: The shortlived National Republican Party, formed in opposition to Andrew Jackson, holds the first convention to feature a keynote speaker.
• 1856: The first Republican National Convention is held in Philadelphia, where delegates form the outlines of today's Republican Party.
• 1896: William Jennings Bryan delivers his famous "cross of gold" speech at the Democratic National Convention, captivating delegates and winning the nomination at age 36.