WASHINGTON (CNN) -- The Rev. Al Sharpton said Monday he is not ready to throw his support behind Sen. Barack Obama's White House bid and suggested the country's only African-American senator was taking the black community's support for granted.

"Why shouldn't the black community ask questions? Are we now being told, 'You all just shut up?'" Sharpton told local New York City station WCBS Monday. His office confirmed to CNN that he made the comments.

"Sen. Obama and I agree that the war is wrong, but then I want to know why he went to Connecticut and helped [Sen. Joe] Lieberman, the biggest supporter of the war," he added.

Sharpton also challenged Obama's support of "tort reform, which hurts police brutality victims."

"I'm not going to be cajoled or intimidated by any candidate not for my support," he said.

Sharpton sought the Democratic presidential nomination in 2004 and has not ruled out another bid in 2008.