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Led by Hillary, 3 jump into '08 race

From NBC's Mark Murray
What a day! We already knew that Sam Brownback (R) was going to throw his hat into the presidential ring this Saturday. And as the AP reported on Friday, Bill Richardson (D) is slated to make his announcement on Sunday. But what we didn't know -- although we knew it was eventually coming -- was that Hillary Clinton (D) would also be making an announcement today.

On her Web site, Clinton made the news we had been waiting for: that she's forming an exploratory committee. "I'm in. And I'm in to win," she said. Recent national polls show Clinton to be leading Democratic rivals Barack Obama and John Edwards. But surveys taken in the important early battlegrounds of Iowa and New Hampshire show either Edwards or Obama to be ahead. 

Meanwhile, Brownback made his announcement -- which was obviously overshadowed by the Clinton news. "I am declaring today my candidacy for President of the United States," he said. "Ours is a great nation and I make one pledge to you, to use our greatness for goodness.