Mediums such as television, movies, radio talk shows and newspapers can help generate a lot of useful ideas. As long as you use that idea as the basis of an entirely original article, you are not in any danger of plagiarism. Real plagiarism comes as a result of improper quoting or not quoting at all. Using facts that are public knowledge is not considered plagiarism unless those facts are copied verbatim from another uncredited source. If you make sure that your article is original, then you can get a lot of inspiration from watching the other media outlets.
Nothing replaces observation.
If you are completely stuck for new material, take time to observe your surroundings. Watch people interact in a public park or mall. Engage in conversations with friendly strangers, or professionals you encounter. Join in an online discussion group to see what concerns are currently on people's minds. By taking time to recharge your creative batteries, you may discover some renewed interest in writing.