I agree that the penalties should be a lot tougher than they usually are in the Age of Obama, but if by "extreme", you mean death sentences, that would be going too far. A few years in jail and loss of the right to vote for life seems appropriate for the ringleaders of any vote fraud scheme, including political candidates on whose behalf the fraud is perpetrated.
Not saying “death penalty” at all.
However, the penalties should be so severe that nobody in their right mind would consider doing it. Permanent loss of the right to vote would be at the top of the list of penalties, no question.