In 2016 more women voted for the president then did men. And women preferred Clinton by a bigger margin than men preferred Trump. Obviously, if the United States had a democratic system the preference of women would have become president. 

The chart below, showing what would happen if only women voted in the 2018 midterms, shows how the preference of women for the Democrats led to that party’s victory in the House of Representatives in 2018.

The chart also explains how the preferred choice of women in 2016 did not become the president. It may very well explain how the democratic nominee may not become president in 2020 unless some states allocate electors to the national popular vote winner. 

The problem is the bizarre electoral college system in which the people in a few arbitrarily chosen states effectively pick the president.  

Despite the huge Democratic preference among women nationally, in 2018, women in Pennsylvania, Michigan, and Wisconsin were less supportive of that party. In many districts in these states women were still in the Democratic camp but statewide the female preference for Democrats was more muted than in the country as a whole. 

These happen to be the swing states where the results of the 2020 election will be determined. Unless the system is changed.