From the AP:
The 20-term Harlem congressman held a news conference on short notice, telling reporters, "My chairmanship is bringing so much attention to the press, and in order to avoid my colleagues having to defend me during their elections, I have this morning sent a letter" asking House Speaker Nancy Pelosi "to grant me a leave of absence until such time as the ethics committee completes its work."
This is another big setback for Obama.