House Appropriations Committee Chairman David Obey, a senior member of the congressional Democratic leadership, will announce Wednesday that he is not seeking re-election this November, Democratic sources told CNN.
Obey, 71, represents Wisconsin's 7th congressional district. He was the youngest member of Congress when he was elected to his first of 20 terms in 1969.
The National Republican Congressional Committee issued a statement saying Obey was facing "the race of his life."
"That is why it is understandable that the architect of President Obama's failed stimulus plan has decided to call it quits. It is ironic that a congressman who became infamously known for his short temper and angry tirades on the House floor, is going out with such a whimper," NRCC communications director Ken Spain said in a statement.
– CNN's Deirdre Walsh contributed to this report