Garin-Hart-Yank Research Group. 5/19-20. MoE 4.5%. (No trend lines)
Bunning (R) 48
Mongiardo (D) 39
Undecided 13
Reelect Bunning: 38
Elect Someone New: 38
And as a bonus:
Bush 49
Kerry 43
It's a partisan poll, so adjust expectations accordingly, but if confirmed this could be good news for Democrats in Kentucky.