He had a good line in response to President Obama’s “you didn’t build that” riff: When the kid comes home and says ‘I made the honor roll,’ and we know how hard they worked, we celebrate that child’s achievement. We say ‘way to go, you made that happen.’

Now, I know that for them to make the honor role he or she had to ride a bus to get to school, and there was a bus driver. But if the kid [makes] the honor role, he or she gets the credit, not the bus driver.
A good line from Romney’s stump speech | Power Line (http://www.powerlineblog.com/archives/2012/08/a-good-line-from-romneys-stump-speech.php)

If we paraphrase Obama's own words, regarding his graduation from Harvard, "You didn't earn that!"