Paul Ryan, Ann Romney, and Mitt Romney at their Lakeland, Florida event Friday morning all did the standard thing of taking the best lines from their convention remarks and incorporating them into rejiggered stump speeches.

This practice works on at least two levels.

First, it recycles zingers, poetry, and other rhetorical moments that are the product of a longer and deeper process than is usually possible in a campaign.

Second, crowds love to hear lines that they recognize from television, because people are obsessed with television.