One such, of course, is the fear of computer hacking by operatives both foreign and domestic. In this age of the internet, such an attack is certainly possible.
However, if the voting databases are kept distributed among the States, this threat possibility, though not obviated, is diminished.
There is another, much easier to implement method of effecting voter fraud. That is, registering people to vote who are, in fact, dead.
Sound far-fetched? Here is but one example. In this case, just a single person "enlisted" the support of 19 dead people to vote for Hillary Clinton.
Here are other examples of recent uncovered voter fraud:
On THIS SITE you will find voter fraud abuses - with details - (by the dead and alive - funded by progressive operatives) in the States listed below.
And, you get the picture - It's very wide spread.
"OK!", you offer, "But even though it's all over the place, the actual numbers of votes cast by fraud aren't that high."
From the last link above, it is estimated that 2.4 million votes have been cast by fraud.
In the last presidential election (i.e., 2012) Obama won by roughly 5 million votes. Now, factor in that the 2.4 million fraudulent votes KNOWN about, fall far less than the actual number of cases of voter fraud. You can see where voter fraud can, and possibly did, sway the election toward the less favored candidate.
What I found to be most enlightening is that the vast, VAST number of fradulent votes were in favor of Democratic candidates. Just think about what that says.
So, when you hear about voter fraud, don't "blow it off" as some conspiracy theory. It's a fact!