Apparently not, because Obama could never be defined as a "leader."
If you throw a lot of mud against a wall, some of it will stick. The Democrats picked up seats this year and last year by having as many recall elections against Republicans as possible, only won a small number of the races, but those few mattered.
It is similar to the Gore 2000 strategy of only recounting votes in heavy Democrat Counties, knowing that whatever errors were made would be made more often by Democrat voters for the simple reason that there were a higher percentage of their voters in those selected counties than would be statewide.
Both are forms of manipulating the process by being selective of where you attack.
In the general election, they don’t get to be selective, and the GOP will pick up the Wisconsin Senate majority again when that election happens.