Obviously, this is if he decides to run for another term.
The biggest reason is people who are Democrat will vote for the Democratic Nominee the way they did for Obama. Think about all of the black people who didn't vote because they didn't believe either candidate had black peoples interest at heart. Think about all of the people who receive welfare and section 8 who didn't vote. Their benefits are now being cut. I think the people in these communities show up and show up big time for voting in 2020. Think about the immigration laws that are not only affecting black people but other races as well like Latinos.
Whoever wins the Democratic Nominee in 2020 will basically be just a faceless avatar to the Democrats that decide to vote. Lol. They really won't care who it is. They will be dead set to get Trump out of office. The Democratic voting lines WILL look like 2008. The thing is Obama embraced all kinds of people and Trump does the exact opposite. He only won because the people who showed originally to vote for Obama didn't show up to the polls. They now have incentive to do so...