Federal laws and guidelines for voting must be followed by the states. I don't see this changing with this act. For example - the voting rights act of 1965 is a federal law that states must comply with for elections. This is what the constitution has to say about it for congress:

> The Times, Places and Manner of holding Elections for Senators and Representatives, shall be prescribed in each State by the Legislature thereof; but the Congress may at any time by Law make or alter such Regulations, except as to the Places of chusing Senators

For president it just says states will send electors chosen by the state legislature. This has been the source of immense fuckery for decades... state legislatures often want to ignore the popular vote and just send their party's electors and it's unclear how the current court would sway if that actually happens (particularly if the state's constitution doesn't bind their legislature to send electors based on the popular vote). Further, federal laws like the voting rights act have often been held to apply to presidential election as well as congress.