As regards US presidential elections, the following is an interesting and cautionary analysis. No, this is NOT about voter fraud.
" Thanks to the unique math
undergirding the Electoral College, the mere presence of 11-12 million
illegal immigrants and other noncitizens here legally may enable them to
swing the election from Republicans to Democrats.
The right to vote is intended to be a singular privilege of
citizenship. But the 1787 Constitutional Convention rejected allowing
the people to directly elect their President. The delegates chose
instead our Electoral College system, under which 538 electoral votes
distributed amongst the states determine the presidential victor. The
Electoral College awards one elector for each U.S. Senator, thus 100 of
the total, and D.C. gets three electors pursuant to the 23rd Amendment. Those electoral numbers are unaffected by the size of the noncitizen population....
Since the census is used to determine the number of House seats
apportioned to each state, those states with large populations of
illegal immigrants and other noncitizens gain extra seats in the House
at the expense of states with fewer such “whole number of persons.”
This math gives strongly Democratic states an unfair edge in the Electoral College."
For the rest of this article see:
http://www.politico.com/magazine/story/2015/10/illegal-immigrants-could-elect-hillary-clinton-213216