The Illinois senator warned former president Clinton he will be confronted if he continues to make factually inaccurate statements.
The former president isn't deterred.
The leading Democrats honored Martin Luther King's legacy at a rally in South Carolina. At the same time a war over words and votes continued between Barack Obama and former president Bill Clinton over remarks Clinton has made about Obama.
"The former president, who I think all of us have a lot of regard for, has taken his advocacy on behalf of his wife to a level that I think is pretty troubling," said Obama.
In Buffalo, New York, Monday the former president ignored the criticism and continued his comments about Obama.
"He said in the '90s the good ideas came out from the Republicans, which will be costly maybe down the road for him, because it's factually not accurate," said Bill Clinton Monday.
Clinton renewed his comments after Obama directly challenged them in an interview on "Good Morning America."
"President Clinton went in front of a large group and said that I had claimed that only Republicans had had any good ideas since 1980, and then he added, 'I'm not making this up.' He was making it up," said Obama on "GMA."
The Democratic primary is this Saturday in South Carolina. Obama needs a victory after two recent defeats.
Former Massachusetts governor Mitt Romney plans to spend all his time campaigning toward next week's Florida primary. He hopes a victory in Nevada will help him.
However, South Carolina Republican primary winner John McCain has different ideas.
"We come in to Florida with some wind in our back," said Ariz. Senator John McCain.
Former New York mayor Rudy Giuliani has done nearly all his campaigning in Florida. Monday he was at the Daytona Speedway.
Giuliani is in trouble in his home state of New York, down now in two polls behind John McCain.
Giuliani got to ride in his campaign bus around the Florida speedway. Earlier he kidded about driving a pace car.
"I want to ride in a pace car," said Giuliani. "Will you let me ride in a pace car? Do I need a license for that?"
There may be another candidate leaving the race. Republican Fred Thompson's campaign isn't denying rumors he is thinking about pulling out.
Meantime, back to the former president versus Obama: "Newsweek" magazine reports that Senator Edward Kennedy and Congressman Rahm Emanuel have called Clinton to tell him to knock off the attacks.