Really? I didn't know that. So winner takes all when it comes to the electoral college is not written into your constitution?
No. The basic rule is that every state is in charge of its own elections, including federal ones. Several constitutional amendments have changed this basic rule to expand voting rights, but the mode of populating your seats in the electoral college remains unchanged: "Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress: but no Senator or Representative, or Person holding an Office of Trust or Profit under the United States, shall be appointed an Elector." That's the only qualification: No senators, no representatives, no federal government officials. Otherwise states can appoint electors in whatever way they choose.