Obama held a virtual town hall Thursday about Latino health care enrollment, organized by Spanish-language TV networks.
To give visitors a way to watch, the White House embedded a live stream from the Fusion network on its own website. Fusion's live stream first shows users an advertisement, known as a "pre-roll."
Some users tuning in through www.whitehouse.gov were shown an ad from the American Petroleum Institute. The ad urges viewers to tell Obama to approve the pipeline.
API has a major online and TV campaign on Keystone. The groups says it's just a coincidence the ad aired on the White House site.
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