Who's got time for all this "learn about who the voter is" or "what flavoring do we add to our brand of BS to make it tolerable"?
Where I come from we cheat for real.
The right way to do it fill out a stack of ballots however you like, and then print out little slips of paper with names on them of voters you suspect won't vote (*) or you know to be dead, incarcerated, etc. In "friendly" precincts any old name will do.
Load up some vans of homeless guys with promises of cash, cigarettes, and cheap booze (**) and make sure each knows who he is supposed to be (***), and drive em from precinct to precinct to vote.
That's how to cheat like a boss... You don't ask who a punter is, you freaking TELL him who he is.
(*) A couple of bucks will usually suffice to keep an average inner city American from voting or vice versa. Quiet word from union boss can do the trick, too.
(**) Pro tip: Make sure you give the cigs liberally as you drive, but do not issue any intoxicants or cash until all the voting is done.
(***) Attempt to make sure the same ID is only used once per precinct