Yes, but when your opponent is steadily losing support and has dropped below 40% in support, you're in less trouble than your opponent.
Do you remember this poll? Other polls around the same time showed Bob with a larger lead than 8. Bob won by 18 points:
Please take this right way - I am not being confrontational at all. Reid needs to be over 50% right now. That is critical for him. He is in HUGE trouble. This poll is a disaster for him. Pay no attention to the trees - look at the forest.