Gov. Scott Walker says it's "hard to tell" what to make of early voting returns showing a third of the ballots cast have come from Democratic strongholds of Milwaukee and Dane counties.

Walker said Friday that given the unconventional campaign Donald Trump is running for president he doesn't know if past voting trends will continue this year.

Walker also says he's confident that Republican grass roots organizing in Wisconsin is strong and will drive strong turnout for GOP candidates on the ballot, including Sen. Ron Johnson.

Figures released Friday show nearly a third of the 70,740 absentee ballots cast so far have been in Dane and Milwaukee counties. Half of the ballots cast statewide have been in person.