Polling companies have different methods of gathering survey information. In the past they would call phone numbers randomly from the phone book, but that is difficult now given the use of cellphones.
Sometimes they will do in the street polls, literally just walk up and ask you.
The method of survey does impact results though. Phone polling skews whatever way the elderly vote, because the elderly are the ones more likely to still have a landlines phone. In the street may exclude views of the disabled or those who don’t get out much.
It’s actually quite tricky to get a random and representative sampling sometimes.
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