It's too bad they've stopped teachin Latin and formal logic (and statistics) as part of the basic knowledge base. You can't even begin to have a decent argument with many people because they haven't been taught to "correctly" interpret exists, somes, alls, nots, not alls, etc.

potis is "capable" as in "having the power/ability to do" but not "having the POWER" as in holding the reins. Potus itself is a drink or a bout of drinking - how about that?