Secretary William Galvin. (Sam Doran/SHNS) After seeing how voting by mail helped lead to a record number of voters casting ballots in the 2020 election, Secretary of State William Galvin said Tuesday he would file legislation this month to make the option a permanent fixture of the Massachusetts voting system. Galvin said his bill would also expand in-person early voting and implement same-day voter registration in Massachusetts, allowing eligible voters who need to register or update their voting information to do so at the polls on Election Day before casting their ballot. Currently, voter...