Here's an example of a Republican who was elected even though he wasn't well-known and even though his views were basically the same as his incumbent Democratic opponent.
GOP Car Salesman With No Money Knocks Off Previously Untouchable Dem
No, this election wasn't some big statement about the defeat of liberalism. It was just, six years into a president's term of office, voters voting against the incumbent party. Has happened before, will happen again.
And as mentioned earlier in this thread - with low voter turnout (36.3%) this means just over 20% of the voters "rejected" the incumbent party. I would assume no one on this thread would jump to some sweeping conclusion based on that limited set of data.