… New private polling shared first with POLITICO showed that Republicans have become overwhelmingly concerned about mail balloting, which Trump has claimed, without evidence, will lead to widespread voter fraud. A potentially decisive slice of Trump’s battleground-state base — 15 percent of Trump voters in Florida, 12 percent in Pennsylvania and 10 percent in Michigan — said that getting a ballot in the mail would make them less likely to vote in November.
For comparison purposes, the poll described above, commissioned by Democratic consultants Katie Merrill and Dave Metz, found that of Joe Biden’s supporters, only 1% felt that receiving a mail-in ballot would make them less likely to vote.