Incumbents have an incentive to restrict the ability of challengers to raise money, and also to prevent independent groups to spend money criticizing the incumbents. Repeatedly legislators have passed limitations on campaign spending, but many of those restrictions have been declared unconstitutional under the [[Free Speech Clause]] of the Constitution.<ref>''[[Buckley v. Valeo]]'' (1976); [[Federal Election Commission v. Wisconsin Right to Life]], 2007; [[Citizens United v. FEC]], January 2010</ref> | Incumbents have an incentive to restrict the ability of challengers to raise money, and also to prevent independent groups to spend money criticizing the incumbents. Repeatedly legislators have passed limitations on campaign spending, but many of those restrictions have been declared unconstitutional under the [[Free Speech Clause]] of the Constitution.<ref>''[[Buckley v. Valeo]]'' (1976); [[Federal Election Commission v. Wisconsin Right to Life]], 2007; [[Citizens United v. FEC]], January 2010</ref> |