First off, Ezra Klein is a guy. Second, bringing up Hillary's pasts is exactly why he is a good journalist as it shows he is not loyal to an ideology. Anyone who talks about how bad Trump is must also acknowledge Clinton's past. That is not equivocating the two but showing that there are issues with Hillary as well as Trump.
Your analogy doesn't make any sense. Klein is not propping up Hillary, he's just stating what Trump is doing to his own campaign.
Reading the whole article and about who wrote it might help before you bash both the journalist and the article.