I get bummed about the world stage, too, until I return to history and see what the stage has looked like over the past 2000 years. And before you say it, I'm referring to current politics/war/economies. Some things are way better, like medicine. Some things are look scary, like climate change and extinctions.
Anyway, I'm willing to consider some of the newer faces in the Democratic field, like Mayor Pete, if he decides to run. https://www.wthr.com/article/howey-mayor-petes-story-going-nationwide As @downzy says, it's about energizing voters to turn out.