"More than 2 in 3 Americans (69%) support establishing national guidelines to allow vote-by-mail and in-person early voting in federal elections in every state. Just 25% oppose this idea. Support for establishing national voting guidelines on these issues comes from 92% of Democrats, 63% of independents, and 51% of Republicans."
Link: https://www.monmouth.edu/polling-institute/reports/monmouthpoll_us_062121/