@Irishk,
Yes, you are right on both counts, Irishk. The incumbent, Blanche Lincoln (D), after an earlier primary in which no one got to 50%, faced off today against Bill Halter (D), the Lt Gov.
Halter got the nod from unions, but you must realize that Arkansas is in the deep south where unions are not at all as strong as they are in the north.
I would argue that the battle here was about the Dem party drifting too far towards the middle or perhaps even to the right of the middle then some Dems want. Arkansas was a bit of a proxy for that debate. And the leftish wing lost. That is the nuance here.
The Repubs will easily gain a Senate seat in Arkansas in November.