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We consider the relationship between the preferences of American voters and the preferences of the U.S. legislators who represent them. Using an Internet-based, national opinion survey in conjunction with legislator voting records from the 109th and 110th Congresses, we show that members of Congress are more extreme than their constituents, i.e., that there is a lack of congruence between American voters and members of Congress. We also show that when a congressional legislator is replaced by a new member of the opposite party, one relative extremist is replaced by an opposing extremist. We call this leapfrog representation, a form of representation that leaves moderates with a dearth of representation in Congress. We see evidence of leapfrog representation in states and House districts and in the aggregate as well: the median member of the 109th House was too conservative compared to the median American voter, yet the median of the 110th House was too liberal. Thus, the median American voter was leapfrogged when the 109th House transitioned to the 110th. Although turnover between the 109th and 110th Senates occurred at approximately the same rate as between the 109th and 110th Houses, the Senate appears to be a more moderate institution whose median member does not move as abruptly as that of the House.

We develop an informational theory that analyzes conditions under which a reelection-seeking executive will act in the public interest. The theory considers factors such as executive competence, challenger quality, and the likelihood that voters will learn the consequences of policy decisions before an upcoming election. We …nd that an executive who has information suggesting that a popular policy is contrary to voters' interests may or may not pander to voters by choosing it; under certain conditions, the executive can actually increase his probability of reelection by choosing an unpopular policy that is in the public interest. However, we also show that an executive will sometimes face electoral incentives to enact a policy that is both unpopular and contrary to voters' interests. We illustrate our model with examples involving