Rep. Susan Davis offers this Roll Call oped (paid subscription required). A snippet: “Critics of voting by mail claim that it causes a rise in voter fraud. Yet studies show that there are more incidents of alleged fraud at polling places than in voting by mail. There are also extremely low incidences of fraud with voting by mail when compared to other methods of voting. The state of Oregon, which runs its elections entirely by mail, has prosecuted only four cases of fraud in the last six elections.”