The chairman of the Wisconsin Elections Commission says poll workers will be trained better to make sure 17-year-olds don’t vote in future elections. At least 60 underage voters in 29 counties cast ballots in last April’s presidential primary — and officials say most learned on social media that they could vote in the primary, as long as they turned 18 before November. Panel officials say Bernie Sanders’ campaign was responsible, saying it blurred the various state election laws to give young readers the impression they could vote — and Elections Commission chairman Mark Thomsen told his fellow members today (Tuesday) that Sanders should take responsibility. Sanders courted the youth vote, and he won the Wisconsin Democratic primary.