Lol just Google it.
No seriously. Some credible sources include
Associated Press
Reuters
NPR (yes I am serious. The facts they report are double checked and when they are wrong, they will admit it.
Also Nate Silver's website 538.com.is well know for trying to get election forecasts as accurate as possible.
But you don't need to go that far. Just start reading the local newspaper. Des Moines Register. Cedar Rapids Gazette, Chicago Tribune, etc
Sources I Would avoid
NEW York Post
Cable news in general. Some cable channels are more trustworthy than others, but their method of reporting is just awful and not useful.
Any guy on AM radio that does one of those monologues where he talks to himself.