Gee.
Let's recall how they got here.
In 2008, the Democrats took full power and pushed far-left, drove the deficit into levels not seen since FDR, tried to make it a crime not to buy health insurance, and was openly musing about using gerrymandering to hijack Congress and establish one-party rule for at least the next decade.
In 2010, they lost big, and Republicans got to dictate the legislature lines.
Now, in 2018, their platform for taking back the House of Representatives is to claim that they were robbed of their Presidency by the Russians, and that Hillary "won the popular vote" (even though no one polled a majority). The same advantages that led to Trump winning the Electoral College also give the advantage to the GOP congress. Thus, the more they can scream their visceral hatred of Trump, the more the Republican-leaning districts, many of whom voted for Trump, are going to resist that.
So please, Democrats, keep screaming about how all those Trump voters are deplorable.