The House Ethics Committee announced Wednesday that it will extend its probe of U.S. Rep. Michele Bachmann's 2012 White House bid, although it gave no timetable for a resolution of the long-standing case.

The decision came with the release of 430-pages of investigative materials from the Office of Congressional Ethics (OCE), which found "substantial reason" to believe Bachmann's campaign violated campaign finance laws and rules barring the use of campaign staff to promote her book, "Core of Conviction."

The OCE report is the first by any of the half-dozen federal and state agencies investigating Bachmann's campaign that offers an official window into the nature and the scope of the allegations arising from Bachmann's topsy-turvy White House bid.

While deciding to pursue the Bachmann case further, the Ethics Committee leaves the four-term congresswoman somewhat in an ethical limbo: The committee chose not to dismiss the case against her; nor did it immediately impanel a subcommittee to conduct hearings into the case.