This is important. I think it's very difficult to see the 'slant' in newspaper editorials unless you read both for's and against's, accounts about the same issue written by different sides. Even the satirical site The Onion is derisive towards the GOP while poking good-natured fun at Dems.
Here's what you need to do: read both liberal and conservative publications! How can you possibly know what you agree with or identify with -or oppose- in a party if you don't know both sides, and know them well?
Wall Street Journal
New York Times
Too many to mention...
Most likely your local paper
Most AP and Reuters news articles
If you have more conservative sites to recommend, please do!