So this article written by the editorial board was about Josh Hartnett's (Pearl Harbor & Black Hawk Down actor) recent visit to the U last Saturday (April 14th) to help campaign for Obama's reelect.
The article notes that regardless of your political affiliation, it's important to become involved with politics. It also quotes Hartnett with "politics seems intimidating, like we don't have an involvement in it."
By making Hartnett the center piece of this article, I definitely think it's a use of ethos, as he has credibility not only with being well known, but he has also worked on campaigns in the past, and has stayed politically active through his busy acting career.
The article also makes mention of Mayor RT Rybak, which is another use of ethos, as he is a big figure in Minneapolis, and has a wide following.