I would have linked to and given credit to Kim Strassel of the WSJ but they won't let me

From her column:

Try this thought experiment: You decide to donate money to Mitt Romney. You want change in the Oval Office, so you engage in your democratic right to send a check.

Several days later, President Barack Obama, the most powerful man on the planet, singles you out by name. His campaign brands you a Romney donor, shames you for “betting against America,” and accuses you of having a “less-than-reputable” record. The message from the man who controls the Justice Department (which can indict you), the SEC (which can fine you), and the IRS (which can audit you), is clear: You made a mistake donating that money.

Are you worried?

Richard Nixon’s “enemies list” appalled the country for the simple reason that presidents hold a unique trust. Unlike senators or congressmen, presidents alone represent all Americans. Their powers—to jail, to fine, to bankrupt—are also so vast as to require restraint. Any president who targets a private citizen for his politics is de facto engaged in government intimidation and threats. This is why presidents since Nixon have carefully avoided the practice.

Save Mr. Obama, who acknowledges no rules. This past week, one of his campaign websites posted an item entitled “Behind the curtain: A brief history of Romney’s donors.” In the post, the Obama campaign named and shamed eight private citizens who had donated to his opponent. Describing the givers as all having “less-than-reputable records,” the post went on to make the extraordinary accusations that “quite a few” have also been “on the wrong side of the law” and profiting at “the expense of so many Americans.”

The real crime of the men, as the website tacitly acknowledges, is that they have given money to Mr. Romney. This fundraiser of a president has shown an acute appreciation for the power of money to win elections, and a cutthroat approach to intimidating those who might give to his opponents…

It’s getting worse because the money game is not going as Team Obama wants. Super PACs are helping the GOP to level the playing field against Democratic super-spenders. Prominent financial players are backing Mr. Romney. The White House’s new strategy is thus to delegitimize Mr. Romney (by attacking his donors) as it seeks to frighten others out of giving…

The Obama campaign has justified any action on the grounds that it has a right to “hold the eventual Republican nominee accountable,” but this is a dodge. Politics is rough, but a president has obligations that transcend those of a candidate. He swore an oath to protect and defend a Constitution that gives every American the right to partake in democracy, free of fear of government intimidation or disfavored treatment. If Mr. Obama isn’t going to act like a president, he bolsters the argument that he doesn’t deserve to be one.