OF course it is. The fattest file on my hard drive is jammed with letters from the disappointed, the dismayed and the irate who find in this newspaper a liberal bias that infects not just political coverage but a range of issues from abortion to zoology to the appointment of an admitted Democrat to be its watchdog. (That would be me.) By contrast, readers who attack The Times from the left - and there are plenty - generally confine their complaints to the paper's coverage of electoral politics and foreign policy. I'll get to the politics-and-policy issues this fall (I...