The main purpose of this legislation, known as the "Let America Vote Act," is to ensure that unaffiliated voters, who do not register with any political party, have the right to participate in primary elections for federal offices. The law aims to enhance voter access and protect the rights of citizens to vote without being restricted by political party affiliation. Key provisions of the law require states to allow unaffiliated voters to vote in primary elections for federal offices. However, these voters can only participate in the primaries of one political party per election.