NEW: Mark Cuban says he is "America First" and would absolutely help out Donald Trump if he is elected president. Here comes the backpedal. Cuban said he doesn't care about all the names people call him on X before declaring: "I'm America First." "I'll do the same thing. I'm America First. You know, that's the wrong way to put it..." "I am what's best for this country, country over party, country overall, I just think Kamala Harris, without any question in my mind, is the better candidate and the better president for this country."