WASHINGTON (CNN) -- Ralph Nader, the consumer rights activist and two-time presidential candidate, sharply criticized Sen. Hillary Clinton Sunday and told CNN he is considering another run for the White House in 2008.

"I don't think she has the fortitude," Nader told CNN's Wolf Blitzer when asked if he would support Clinton's candidacy. "Actually, she's really a panderer and a flatterer as she goes around the country. You'll see more of that."

Saying he doesn't like "long campaigns," Nader said he would decide on a presidential run "later in the year."

When asked if he would be more likely to run if Clinton won the Democratic nomination, Nader said, "It would make it more important that that be the case."

Nader angered many Democrats in 2000 who felt he peeled enough votes away from Al Gore in Florida to hand George Bush the election victory.