SurveyUSA polled Wisconsin voters on their ticket preferences:

Obama/Webb - 48
McCain/Bloomberg - 40

Obama/McCaskill - 46
McCain/Bloomberg - 40

Obama/Schweizer - 45
McCain/Bloomberg - 40

Obama/Webb - 47
McCain/Jindal - 40

Obama/McCaskill - 46
McCain/Jindal - 39

Obama/Schweizer - 45
McCain/Jindal - 39

Obama/Webb - 45
McCain/Fiorina - 38

Obama/McCaskill - 44
McCain/Fiorina - 38

Obama/Schweizer - 44
McCain/Fiorina - 38

Obama/Bloomberg - 44
McCain/Jindal - 39

Obama/Bloomberg - 44
McCain/Fiorina - 38

Not much difference no matter who's on the ticket. Which could mean that Wisconsin voters just aren't that familiar with these potential veeps and so altering the ticket doesn't matter.