The midterms have just set the stage for a tough 2020 presidential fight

The 2018 midterm elections were like no other in recent memory: record turnout combined with vitriolic rhetoric from the current occupant of the White House – President Donald Trump. Peter Finn and Robert Ledger write that ahead of the 2020 presidential election, both the Democratic and Republican parties will be taking lessons from their victories and defeats in a country which appears to be at a crossroads more than ever.