A look at spending on digital advertising in the 2020 presidential election.

Plus, a look at impeachments of the past. 

Purple-district Democrat, Rep. Colin Allred of Texas, joined Politics with Amy Walter to discuss what changed his mind on the impeachment inquiry. 

A look at Trump administration's legacy on climate change. 

For the first time this year, the top polling Democratic candidates share a debate stage. 

Climate change has become a front-and-center issue for the candidates hoping to win the Democratic nomination. 

Democrats and Republicans speak different languages when it comes to the Constitution. 

Plus, a look at how the Trump campaign spent its summer.

Is restoring unions the best way to rebuild the middle class?