This is an example of why we need more viable political parties. Which is why we need a better voting system (ranked choice, approval, etc) so that other parties can become viable and start influencing politics. Of course neither of the two dominant parties want their power reduced in this way.
In the UK we have a few more political parties, but still only 2 dominate. Those 2 parties do actually differ on something: Labour wants to borrow and spend, the Conservatives want to be fiscally responsible. Aside from that though, things like foreign policy, defence spending, mass surveilance etc, are all the same - doesn't matter who you vote for.
