UPDATE: Wednesday, November 21, 2012

Rep. Jesse Jackson Jr. admits to "his share of mistakes" his resignation letter to House Speaker John Boehner and acknowledges an ongoing federal investigation.

The Illinois congressman resigned on Wednesday after being on a months-long medical leave for bipolar disorder. His resignation comes just two weeks after voters re-elected him to a ninth full term and amid reports of a new federal probe into possible misuse of campaign money.

In his letter, Jackson says he is doing his best to address the situation responsibility, cooperating with investigators and "accept responsibility for my mistakes." He also says his constituents "deserve a full-time legislator in Washington," something that wasn't in his future because of his health issues.

Wednesday, November 21, 2012

A spokesman for House Speaker John Boehner says he has received letter of resignation from Rep. Jesse Jackson Jr.

Boehner's spokesman Michael Steel said Wednesday the Speaker's office received a letter of resignation from Jackson. Boehner's office did not immediately comment beyond acknowledging they'd received the letter.

Jackson was easily re-elected earlier this month to a ninth term despite not having appeared in public since quietly taking medical leave in June for treatment of bipolar disorder.

The House Ethics Committee has been looking into whether Jackson was involved in discussions about raising money for imprisoned ex-Gov. Rod Blagojevich's campaign in exchange for an appointment to President Barack Obama's vacated Senate seat.

There also have been reports of a federal investigation into possible misuse of campaign money.