No American is dedicating as much of his money to defeat President Obama as Sheldon Adelson, the casino magnate who also happens to have made more money in the last three years than any other American. He is the perfect illustration of the squalid state of political money, spending sums greater than any political donation in history to advance his personal, ideological and financial agenda, which is wildly at odds with the nation’s needs.

Mr. Adelson spent $20 million to prop up Newt Gingrich’s failed candidacy for the Republican nomination. Now, he has given $10 million to a Mitt Romney super PAC, and has pledged at least $10 million to Crossroads GPS, the advocacy group founded by Karl Rove that is running attack ads against Mr. Obama and other Democrats. Another $10 million will probably go to a similar group founded by the Koch brothers, and $10 million more to Republican Congressional super PACs.

That’s $60 million we know of (other huge donations may be secret), and it may be only a down payment. Mr. Adelson has made it clear he will fully exploit the anything-goes world created by the federal courts to donate a “limitless” portion of his $25 billion fortune to defeat the president and as many Democrats as he can take down.

One man cannot spend enough to ensure the election of an unpopular candidate, as Mr. Gingrich’s collapse showed, but he can buy enough ads to help push a candidate over the top in a close race like this year’s. Given that Mr. Romney was not his first choice, why is Mr. Adelson writing these huge checks?