Depending on the state, your new spouse's income can definitely be used in calculating alimony. Given that, I would not be surprised if some states also use a 2nd spouse's income in determining child support.
Not quite sure about the accuracy of that statement.
I know of no states where a new spouses income could be used as a basis for CS for a step-child. The new spouse is not a party to the child's birth, the divorce, divorce case, and has no legal obligations to the child. The only (weakly) arguable connection would be if they offset some expense normally paid by, or convey some income to, the parent obligated for support.
Re spousal, same situation, with the exception that by virtue of getting married & securing an employed spouse, a person could lose Spousal / alimony they are receiving. Remarriage & co-habitation clauses are somewhat common in alimony / spousal support situations.