Actually, I’ve seen the democrat precinct leaders in action.
Any possible voter, they befriend (or in facebook parlance “friend”). They make voting a friends and family affair.
It is very powerful.
The Democrat vote is extremely CONCENTRATED. Mainly in one party urban areas run by Democrat political machines and their government union allies. Often there is little or no bipartisan oversight or supervision in these inner city precincts, hence the Dems have free rein to pad their vote totals with little risk of getting caught.