In an email to supporters today (PDF), President Bush claims that “Together, with a Republican majority, we passed tax relief that spurred unprecedented growth and now need to make that relief permanent.” But as this graph of changes in real gross domestic product since 1947 makes clear, growth under President Bush has hardly been “unprecedented”:

Nor do we find any support for Bush’s claim when we restrict our attention to the post-1980 period — indeed, it’s obvious that growth was generally higher under President Clinton: