Sure, providing he doesn't disguise his biases as objectivity.
America was built on a proud tradition of muckraking journalism, and prior to that, shamelessly partisan political broadsides and scandal sheets. In fact, I submit it is impossible to report on any topic in detail without injecting some of your own biases into it, even if you conscientiously try to avoid doing so.
Bad journalism is when you evade controversy and deliberately avoid an issue altogether, or when you carefully select your facts to support your case and disguise it by affecting the appearance and language of objectivity.