Policy and research institutes are excellent places for finding well-researched information, often written by scholars but presented in accessible language. Complex ideas are distilled into understandable concepts without losing academic rigor. These are perfect resources for undergrads! Be aware that some policy institutes espouse certain biases. A quick search on Wikipedia will allow you to sort out where each stands on the issues.
Be sure to check out FindPolicy. It allows you to simultaneously search multiple research and policy institutes.