If Trump attacks Hillary because she is a woman, he is going to deserve the blow-back he gets. I think he knows better than that.
If Trump attacks Obama because he is black, he might as well pack up and go home.
There are many reasons to attack both: Obama's administration is a target-rich environment -- illegal immigration, Obamacare, EPA.... I could go on and on.
Hillary has a long history of bad behavior, with verifiable facts. She has zero accomplishments of any note.... as Senator, she passed hardly any legislation, and the Middle East is a disaster after her tenure at State. And there's that criminal investigation.....
Those are examples of specific things they have done, and/or screwed up. There will be many that will say: oh, Trump's attacking her because she's a woman, or Obama because he's black. But, they are just bleating like sheep unless Trump actually says that.
If a man is wrong, like Curiel, he is wrong. Sex, color, ethnicity, sexual orientation be damned.
Then, why didn't Trump say WHY Curiel is biased against him? He's a member of an association that advocates for illegal aliens, and it's affiliated with another that is actively protesting against Trump.
Those are verifiable charges. But instead, Trump complained about his "Mexican heritage", and made it about ethnicity. The reference to a "Latino lawyer association" got lost in the noise.
You are buying what the MSM is selling. Ok, it’s your money.