Chris Mooney makes the case against knee-jerk centrism, particularly the false equivalence of the "centrist 'pox on both your houses' approach:"
Just because the left is not always 100 percent factually correct, it does not follow that the left and right are equally wrong, or that the left and right handle or process information in the same way, or that they're equally biased, just in opposite directions. [...] If knee-jerk centrists really want to make a serious argument, then they should start by showing one or more of the following:
1. The dramatic extent of left anti-science, and how it equals or surpasses right anti-science.
2. The regular mainstreaming of left anti-science in the Democratic Party.
3. Left wing distrust of science that is equal to or greater than right wing distrust, as shown in national polling data.
4. Psychological evidence that the left and scientific community aren't actually aligned, or that the right and the scientific community are just as well aligned as the left and the scientific community.
It should be apparent that no such serious argument will be forthcoming--because none exists.