they aren't always easy to replace. You can't just vote them out. They have stances on other issues, so unless you're voting for one person whose only roll in office is to run heathcare you can get mitigating factors.
For example, I know a woman who was planning to vote for candidate A, running as an independant, because she liked his stances on taxes, security, and education, as opposed to the candidate B, the incumbent, who was doing a mediocre job on those issues. However, when she realized that candidate A was pro-choice she immediately switched her vote to B, who was pro-life, despite B's worse performance on other issues.
So, unless healthcare is the crucial issue for all voters, a politician who is bad in healthcare but good on other issues will not necessarily be voted out. With private insurance, there will always be other companies competing for your money. |