Wisconsin : The red state no one saw coming .

The Boston Globe reports reports on Wisconsin :

Clinton herself never campaigned here during the general election, and Trump deluged the airwaves with television advertising, which may have helped him secure the victory margin of less than 30,000 votes, state political analysts said. And, according to the Wisconsin State Journal, Trump made at least five visits to the state in the final three months of the campaign.

Why did Democrats dis-respect Wisconsin this election cycle?