Short on time and tempers, House and Senate candidates in tight races are turning snarky and personal in their attacks on their opponents.
The stakes, and the unpleasantness, are highest in the race for control of the Senate, where Republicans need to gain four seats to win the majority - only three if Republican Paul Ryan becomes vice president and, in his role as Senate president, breaks any tie votes.
In the battle for control of the Senate, neither Republicans nor Democrats have put away enough seats to tip the balance of power.
Republicans are favored to hold onto the House, where Democrats need to net 25 seats to regain control, but both parties want to win as many seats as possible.