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Someone told me that his undegrad thesis was published, which may be this one :
"Using Repeat Challengers to Estimate the Effect of Campaign Spending on Election Outcomes in the U.S. House." Journal of Political Economy, 1994, 102(4), pp. 777-98.
If Levitt did someting publishable in undergrad, it was a good signal to the ad com that he is a good potential researcher, which is strictly better quant guys.
In addition, as far as I know, the ad com are more concerned about the research ability of the applicants rather than their math skills. As you know, it is common that many top 5 grads with excellent math skills cannot get a paper published in a top-tier journal.
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