For weeks, leading Democrats have castigated pro-Republican special interest groups involved in the current election campaign for what they describe as secretive fundraising practices. USA/

In an effort to call further attention to the activities of groups like American Crossroads GPS, a political fundraising committee which GOP guru Karl Rove helped to set up, some prominent Democrats and non-partisan election watchdogs have written law enforcement agencies demanding official investigations.

But there is little indication that any relevant agency is going to launch an  in-depth probe anytime soon.

In early October, the liberal activist group MoveOn.org sent a letter to the Justice Department demanding that it investigate allegations that the U.S. Chamber of Commerce had received election-related funds from unspecified foreign sources — something the Chamber emphatically denies. A similar request for an investigation was sent by Senator Al Franken, a Minnesota Democrat, to the Federal Election Commission.

Around the same time, two political finance watchdog groups, the Campaign Legal Center and Democracy 21, sent a letter to the Internal Revenue Service requesting an investigation into whether Crossroads GPS is violating its status as a tax-exempt organization by spending too much of its time and resources on electioneering.