The correct answer to this open question is the following.
An advantage of holding State elections separately from federal elections might be that voters would focus more on state-level issues and candidates.
This is so true because when there is a federal election, most of the attention is on the Presidential campaign, the candidates, the debates, and all of the infrastructure that supports a presidential campaign in the United States. So when it is just a state election, voters can focus on the issues and problems in their states. There are no presidential election distractions, just focusing on party platforms and candidates promise to solve problems in the state.
