October surprise
The October surprise, not quite a surprise like the Jim Comey surprise that torpedoed Hillary's campaign, but it'll do, is the widening war in the Middle East, Israel going into Lebanon and now beginning to spar with Iran, which Netanyahu promises retaliation for, and who knows where that will lead. The upshot is that it might just sink Kamala, as if all this is her fault. But that won't stop Trump from beating it like a drum with statements like, "This would never happen on my watch," and "Only I can fix it."
I fear the worst, Trump back in the Oval Office.