If one looks back at the 2016 elections in the United States, there is really a quite simple explanation as to why Donald Trump defeated Hillary Clinton. The so-called hard core of Trump's supporters was extremely fired up by the possibility that he might win. They were enthusiasts. They campaigned vigorously. They made sure that their voters voted. They put pressure on other Republicans and Independents (and even on some Democrats) to work for Trump, even if they had reservations.

The story with Hillary Clinton was quite different. Her hard core was less hard and worked less hard for her. Many of her voters and possible voters supported her only because they were anti-Trump. There was little enthusiasm, and it showed. Even if they voted for her, they spent far less energy on mobilizing others. They put less pressure on potential voters. They were sure they would win, and could afford therefore to do less.

If we look at the political situation in July 2017, there has been a major shift in enthusiasms. The hard core of Trump supporters is now like the hard core of Clinton supporters in 2016. They support Trump because they are anti-Democrats. Nancy Pelosi is their symbolic force of evil.

They are "disappointed" in Trump. He has not delivered what he promised. He is surrounded by the Goldman Sachs people he once denounced. His approval ratings, low at the beginning of his term, have continued to fall, even among the hard core. They are still supporting Trump because the other side seems far worse. But they drag their feet a bit. The proselytize less. They campaign less. They put less pressure on friends and family. They do less to get out the vote.

If one looks at the Democrats, the opposite has happened. They smell a chance. They have never been so united in their refusal to support Republican propositions. While the Republicans in the Senate struggle to get near unanimous support of Republicans for their proposals, the Democrats sit back and let them fight among themselves. They organize locally, and at the level of the separate states.

While on paper this seemed like an election the Republicans couldn't lose, in the last two months or so bloggers are putting forth analyses showing that it might be possible for the Democrats to win back the Senate and even the House of Representatives. Possible is not certain, but even possible seemed not so long ago a fantasy.

To be sure, the Democrats are divided on a major issue — their electoral strategy. The question is a very clear one. Should they put forth candidates who are "centrist" on the grounds that this will attract the centrist votes that the Republicans seem to be losing? Or should they move to the left — nominate someone like Bernie Sanders or Elizabeth Warren on the grounds that this will energize an enlarged left base. In short, should they bank on utilizing enthusiasms, or not?

The Democrats are arguing about this. But the camp for a left program has grown notably stronger. In 2016, everyone across the spectrum moved right. Will everyone move left in 2018? We can't tell yet. But it depends on mobilizing enthusiasms.

Now, suppose the Democrats move left in 2018 and then actually win back the national legislature and some gubernatorial races? Will this be the "revolution"? Far from it. But it will mean some better short-run decisions that will, as I like to say, "minimize the pain" for the poorest members of the population. So, it's a short-term plus. The middle-term battle about the world we wish to build to replace the flagging capitalist system in which we have been living still needs to be fought. However, the organizing experience of a short-term left campaign by the Democrats in 2018 will enhance the skills of those who are ready for the bigger middle-run battle.

The next six months or so should be very interesting to watch if we keep our eye on the ball — energizing the left and remembering the major struggle we face after 2018.

- Immanuel Wallerstein, Senior Research Scholar at Yale University, is the author of The Decline of American Power: The U.S. in a Chaotic World (New Press).

Copyright ©2017 Immanuel Wallerstein -- used by permission of Agence Global