That comes to 4 votes per state per year. Out of millions of votes cast.
Let's look at it like this:
Democrats have been going 'full-bore' conducting multiple investigations for 10+ months trying to find criminal activity by Trump. They even hired Mueller and let him assemble a 'I Hate Trump' dream team...and hove found NOTHING. Snowflakes are quick to respond by saying, 'NOT YET - the Investigation is NOT OVER!'
There has not been the same vigor, desire, by the Democrats to investigate illegal voting. In fact, they want no such serious investigations....
...and unlike the Democrats' investigations of Trump, Evidence HAS been found of criminal activity. HAVING PRODUCED NO EVIDENCE investigating Trump Democrats are still rabidly determined to continue to investigate...but in cases where criminal activity HAS been proven (voter fraud, Obama administration illegally leaking info, unmasking Americans, Felony Espionage, etc...) they want to shut those investigations down / don't want them investigated....
Now why is that, that Democrats do not want crimes that negatively impact them investigated but relentlessly go after cases which potentially benefit them that have not produced evidence?