Interest groups are introduced in a spatial model of electoral competition between two political parties. We show that, by coordinating voting behavior, these interest groups increase the winning set, which is defined as the set of policy platforms for the challenger that will defeat the...

The paper considers public funding of political parties when some voters are poorly informed about parties' candidates and campaigns are informative. For symmetric equilibria, it is shown that more public funding leads parties to chose more moderate candidates, and that an increase in the...