Six years ago, Senate Majority Leader Harry Reid celebrated what he called a "love fest" of government support for the construction of a proposed 150,000-home community in the Nevada desert and the lobbyist-turned-developer behind it, Harvey Whittemore. Last week, a federal grand jury charged Mr. Whittemore with making illegal political contributions to Mr. Reid, a Democrat. Even before the indictment, Mr. Reid and other politicians had begun to distance themselves from Mr. Whittemore—long one of Nevada's most powerful lobbyists—by pledging to charity money to offset donations they had gotten from him. ~~snip~~ The allegations against Mr. Whittemore stem from a...