Tova Wang has written this report for the Century Foundation. From the press release:

As states clamber to move up the dates of their presidential primaries, politicians and political
parties are scrambling to rethink their campaign strategies. Much of the news coverage of this issue has focused on the impact of those changes on particular candidates. However, in a new issue brief from The Century Foundation, Democracy Fellow Tova Andrea Wang warns that more attention needs to be paid to the impact of a changed primary schedule on voters and on the democratic process. She argues that, while the news about frontloading the primaries may not be all bad, the voting rights and civil rights communities need to make sure that any changes to the primary system enhance the democratic process by serving the rights of the voters.