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I'm looking for data on presidential approval polls going back as far as possible. Gallup has this data, but is not available to public. (http://news.gallup.com/interactives/185273/presidential-job-approval-center.aspx)
There is also data available from The American Presidency Project (http://www.presidency.ucsb.edu/data/popularity.php?pres=45&sort=time&direct=DESC&Submit=DISPLAY), but the site doesn't provide a link to the data.
You can tweak the url for The American Presidency Project to get the data on a specific president. For example, here's the url for Obama: http://www.presidency.ucsb.edu/data/popularity.php?pres=44&sort=time&direct=DESC&Submit=DISPLAY
Scraping the data from that site is pretty simple depending on your tools. You could also easily copy & paste the table into a spreadsheet, if scraping isn't your thing.
