No, the Democrats aren’t going to take over Texas, and no, they’re not poised to retake majorities on Capitol Hill. Here’s a new entry in McKay’s Rules of Politics, a list I need to compile in writing in this space at some point (and if you’d like to make suggestions to assist in populating such a list in the comments, feel free) — whenever mainstream media conventional wisdom crystallizes into a narrative so pervasive that even the pet Republicans on the CNN and MSNBC shows act as though it’s inarguable, said narrative is almost universally false and will be proved...