You can be sure of a 20% fraudulent vote count for Zero.
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Now, that’s a stretch. Think about what you are saying.
Only 20% ??
The massive voter fraud in Racine, Wisconsin - a dry run for November, according to WassermanShultz - was higher ... districts with hundreds of registered voters had thousands vote. Naturally the Dem canidate won ... the voters in the new district he won were excluded from the election by the Democrat controlled Election Board.
In big cities like Chicago, NYC, Atlanta, etc. I think 20% is quite plausible.
Over estimating your opponent is a mistake.
Under estimating your opponent is a bigger mistake.