The definition of conservative is far more complex than this article makes it out to be. This article ignores the myriad of cross cutting cleavages which may fall under the definition of conservative. You see there are many types of conservative ideology which one may possess or not possess. For example, you have social conservatives, fiscal/economic policy conservatives, legal conservatives (which are people the uphold precedent for the simple fact that its precedent whether they agree with it or not), there are defense conservatives and the list goes on. The truth is the word conservative and the word liberal are loaded and mean 20 different things to 20 different people. This article is incredibly superficial about what it means to be conservative. Besides, I think most people including liberals would agree to the second statement that human nature is reflected in government but that certainly doesn't mean that they are right wing. What do you do when one person views an action as conservative and another views the same action as liberal because of different methods of reasoning?
While you are bringing many valid points, I take it that the essential point of the article is that many cling to the Democrat party (and vote for them) when they really live by more conservative values; and keeping voting Democrat works against their own behavior and interests. It implies also that the real divide is not 50/50 like elections show, but more in favor of conservatism.