Purdue has straddled 45% in three straight polls, also this poll shows Lieberman and Warnock doing about the same, which shows that it may not be a total disaster for Democrats, if Lieberman wins. Anyways, Purdue is in big trouble this fall, though I still think he survives by the skin of his teeth. But, I will be shocked if Republicans hold both Senate seats and would not be shocked if Democrats ultimately won both.
Winning the second seat in a runoff is still going to be impossible for the Democrats. The fall-off is going to be as large as it was in 2008. Winning the first seat in the GE is definitely possible, though. The Democrats should change the law to have runoffs held on election day as soon as they gain the power to do so (or just get rid of the jungle primary, which was specifically designed in the South to disenfranchise black voters).