As I've said before, Democrats have been overplaying their hand - in spectacular fashion - for years. Their widespread assumption that Hillary Clinton would win the 2016 election in a landslide may be the most obvious example, but it's certainly not the only instance, nor is it the most recent. That honor goes to the Schumer shutdown.
Dems were absolutely, positively, convinced that Trump would catch hell over the government shutdown. They honestly expected a replay of 2013. They didn't get one. It quickly became clear that the American people were aware that Democrats had initiated the shutdown, they had leveraged children's healthcare against their agenda, and that agenda was designed to help millions of illegal immigrants.