I have no idea what Electors have to do with this, so please elaborate.
Sure a state DA may bring charges. But it will be challenged 6 ways to Sunday. Can a state bring charges against POTUS? Civil suits, yes, at the convenience of the defendant. Criminal charges? Appeals apeals appeals... Then there are still the other questions: Selective prosecution, is there a crime, is there willful knowledge a crime was committed, can you flip a client’s attorney into a witness against the client? A to the latter only if they are both engaged in a crime together which they will do doubt allege but as other said this was routine Trump paid many women over the years this one is “illegal” only because he won the election.
Presidential "elections" are not provided for in the Constitution. They are unnecessary to the choice of the President or Vice President, which is made by Electors appointed by the State Legislatures, in whatever way makes sense to them.
It so happens that all 50 State Legislatures have chosen idiots voting as their method of appointment, but any of them could change that tomorrow without running afoul of the Constitution.
Congress, in Article I §4, has authority over (can regulate) elections for Senators and Representatives: "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 [sic] Senators".
This section does not confer authority on Congress to regulate the methods State Legislatures choose to appoint their Electors. And no other Article or Amendment does so, either.
Therefore: All laws about campaign finance, donations, spending, primaries, commissions, or debates are unconstitutional and void. The only power Congress has over the choosing of Presidents and Vice Presidents is the structure of and rules for the Special Joint Session that opens and counts the Electoral Votes.
The voting that takes place in each State on the first Tuesday after the first Monday in November is not a Federal election. It is 50 separate State elections, that take place under rules made by the State Legislatures.