According to the rules of the Electoral College, Marcus will win the election.

Why might some see that as a problem?

The correct answer to this open question is the following.

Although the question is incomplete and does not provide any options or further references, we can say that some might see that as a problem because of the following: "All states splitting their electoral votes between the candidates based on what percentage of the popular vote they won."

To understand this answer we have to include the following idea. The scenario described in this question is a supposed presidential election organized in 2028. There are two candidates. Democratic Senator Rosa Marcus and Republican candidate Ted Torres. Marcus was declared victorious after having 5 more Electoral votes than Torres. With those 5 more votes, candidate Marcus reaches the 270 votes needed for the Electoral College could get a winner in the election. So with that context, the kind of adjustment needed in the Electoral College to change a situation like this would be that all states splitting their electoral votes between the candidates based on what percentage of the popular vote they won.