They haven’t tried to hide it for years. And that is why their circulation is down nearly 50% in 10 years.
Some AP writers are blatantly biased leftists and the mentioning of GOP politicians in trouble, while not identifying the Democrats, is typical of their tactics.
CALL or EMAIL AP headquarters and document this bias. Call them on it and ask them what they are going to do to (a) stop the bias and (b) to discipline the writer.
Pack a big lunch for a long wait.
PS: SOme of us have been writing about this bias for years. I did so at www.augustafreepress.com (see their Archives for Max). So has the conservative Media Research Center (MRC) and they publish a nearly daily journal of these examples of leftist media bias.