Pastor Kevin DeYoung has written a really helpful article entitled, 10 Things to Remember as the Presidential Campaign Season Gets Into Full Swing. 

You'll want to read the enitre article, but here's the gist of it:

1. We’re not electing a king. 
2. Elections matter.
3. Character matters. 
4. The best predictor of future performance is past performance. 
5. You almost certainly will not have a beer with the next president. 
6. The big picture matters more than all the details. 
7. The candidates will say something stupid. 
8. The media will do very little to help you understand the issues and what each candidate believes.
9. It is extremely unlikely that either party will nominate someone with no political experience. 
10. The system could be much worse.