Rasmussen Reports conducts a daily Presidential Tracking Poll which measures the president's job approval rating. Rasmussen Reports notes that, "It is important to remember that the Rasmussen Reports job approval ratings are based upon a sample of likely voters. Some other firms base their approval ratings on samples of all adults. Obama's numbers were almost always several points higher in a poll of adults rather than likely voters. That's because some of the former president's most enthusiastic supporters, such as young adults, are less likely to turn out to vote." "Newsweek" also notes that polls of all adults produce results that are more favorable to Democrats than do polls of likely voters. Mark Blumenthal of "Pollster.com" notes that, "Rasmussen's Obama job approval ratings do tend to be lower than most other polls, but they are not the lowest."