So, what went wrong? For starters, most polls are still conducted by phone. And not only by phone, but by landline.
The problem is that people just don’t answer their phones for pollsters anymore. Fewer people have landlines, there are new prohibitions on autodialing cellphones and people rarely pick up phone calls from numbers they don’t recognize; not to mention suspicion of solicitations from strangers.
I don’t even use a landline anymore, except as a fax line, as a backup to my alarm system, and for emergencies. Most millennials don’t have one at all.
Polling has been disrupted and failed.