Yes. The Democrats keep losing counties and gaining voters.
This is also happening at the state level, and is causing the Senate to become ridiculously radical. It only takes the support of 5.1% of US voters to filibuster a bill, and 12% to defeat a filibuster:
The "supervoters" making up that 5.1% and 12% are mostly in Republican states, and this has led to the Republican party drifting farther and farther right of the mainstream over time. For example: