The influence of money in today's politics is undeniable, in Missouri and everywhere else. We explore campaign contributions, PACs, "dark money" groups and more, not only in big races like the U.S. Senate race between Claire McCaskill and Josh Hawley, but also in tight local races like the fight for the Missouri Senate seat in Platte and Buchanan Counties. We talk with Republican Tony Luetkemeyer and Democrat Martin Rucker , and St. Louis Public Radio's Jo Mannies . (For more of the conversation