Objectivity and Fairness

Eric Deggans at HuffPo writes about objectivity vs. fairness in journalism (in the absurd context of Bill O'Reilly doing research on journos' political affiliation): http://www.huffingtonpost.com/eric-deggans/why-is-bill-oreilly-keep_b_35512.html

It is often noted that journalists in the U.S. more proportionately register as Democrat than Republican. It is not-so-often noted that doctors, lawyers and scientists are also disproportionately Democrats. Do we question doctors' ability to do their jobs whether their patients are Republicans or Democrats?