Today on Politics with Amy Walter, we follow the money in the 2018 midterm elections. Where is it all coming from? And what is it doing to our democracy? The big money is spent on competitive races - and those costs get up into the tens of millions. This hour we hear from political strategists and the people behind the money being spent on both sides of the aisle. Plus, a look at how the Citizens United decision became a turning point in American politics, and whether the money can ever really be taken out of politics for good.

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