Are you claiming all pollsters are biased?
No, but as you said, these special elections are motivating to people who really, really, really care. People who care that much are biased, and any polls they produce will be biased.
Low turnout is also most certainly NOT a wash, in fact low turnout is the exact opposite because it emphasizes the motivation of voters on each side, the ground game of each side, etc, etc. What neither you or I know is which side low turnout benefited the most, because we don't have good information on the district. Generally, low turnout favors Republicans, but the incumbent probably had a better ground operation.
That's what I meant by low turnout being a wash. We simply don't know whose argument is favored by low turnout.
I should have been clearer, but I was simply trying to reiterate what I had previously written. You probably shouldn't draw any conclusions from this, but if you are determined to do so the evidence points more favorably for the Democrats.
I did some more research and after the 2008 elections, a very strong (D) year that also involved big national elections (esp. the President), Dems held the WI State Senate 18-15. In that light, you are correct to assert that Dems performing in this one election like they did in 2008 is good for Dems.
However, of the six Repubs up for recall, one has been there since 1987, one since 1992, one since 2000, two since 2004, and one since 2008. ...And the one who first got elected in 2008 replaced a nearly 20 year term Republican. One who was first elected in 2004 replaced another nearly 20 year term Republican, and the other who was first elected in 2004 ran unopposed in 2004 and 2008. Edit: I just looked up each of the six Repub's election results from 2008, and three of them won by narrow margins, while the other three won handily.
So, considering the bigger picture, if the Dems perform the same in the recall elections this year as they did in 2008, they
will not retake the WI State Senate because they will not defeat three sitting Repub senators. This isn't even accounting for the fact that Dems need to hold the remaining two seats they have that are still up for grabs.