JUDY WOODRUFF:
Along with Edwards, four other Democrats have moved past the exploratory phase to say they are definitely in the running: Connecticut Senator Christopher Dodd; former Iowa Governor Tom Vilsack; Ohio Congressman Dennis Kucinich, making his second bid; and former Alaska Senator Mike Gravel.
Another Democrat expected to enter the race is Delaware Senator Joseph Biden, while 2004 Democratic nominee John Kerry, 2004 candidate General Wesley Clark, and former Vice President Al Gore, the 2000 nominee, are all possibilities.
As for the Republican field, several candidates have formed exploratory committees: Arizona Republican John McCain, who failed to get his party's nomination in 2000; former New York City Mayor Rudy Giuliani; Mitt Romney, the former governor of Massachusetts; and California Congressman Duncan Hunter.
Those who already have formally announced their candidacies include: former Virginia Governor James Gilmore; Tommy Thompson, former Wisconsin governor and former secretary of health and human services in the Bush administration; and Kansas Senator Sam Brownback, who announced his candidacy on Saturday in Topeka.
SEN. SAM BROWNBACK (R), Kansas: America is great because she's good. That goodness is not based in Washington or New York or even Topeka; it is based in the hearts of the American people.
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