Though Obama has pressed the Justice Department to investigate his political opponents, DOJ doesn't sound too supportive of the idea. Malkin posts a report on the matter:

The Justice Department does not pursue criminal investigations of contributors to independent political groups, even when they give $1 million or more and even when their money is solicited based on an appeal to support or oppose a candidate, according to DOJ’s top election crimes official.

“You don’t see a whole lot of cases” where DOJ is looking at independent groups, said Craig Donsanto, the veteran director of the Election Crimes Branch in DOJ’s Public Integrity Section.

Donsanto made his comments Sept. 12 at a conference on corporate political activities in Washington, sponsored by the Practising Law Institute.

Asked directly during a panel discussion at the PLI conference whether he would approve of a case against a hypothetical contributor to a Section 527 group who gave a seven-figure donation based on a request to help or harm the prospects of a particular presidential candidate, Donsanto said, “No.”