In theory maybe but from a practical standpoint this is not a serious problem for the country. Voter fraud is a serious crime and most legal and illegal immigra

In theory maybe but from a practical standpoint this is not a serious problem for the country. Voter fraud is a serious crime and most legal and illegal immigrants are trying to avoid commiting federal crimes that are highly visible. Voting by mail creates a paper trail, making it easy to audit and detect fraud (more so than checking a piece of plastic). All the research suggests that mail in voting has a neutral partisan effect (with a potentially slight win to conservatives since it favors rural and elderly populations). Ultimately questions of fraud detection could be framed according to the cost of false positives vs false negatives. The reason that people on the left get upset over vote ID laws is that they create a lot of false negatives, for a very small decrease in the number of false positives - this is structural to voter turnout (~40% of people don't vote, vs. <1% voter fraud (0 convictions)).