an extraordina moment in the rose gardens, bowing out but delivering a call to action and taking a swipe at hillary clinton who has moved away from some of obama's policy. >> this party, our nation, will be making a tragic mistake if we walk away or attttpt to undo the obama legacy. >> reporter: biden, who made his decision last night, said the grieving process over his late son beau was pivotal. >> i've said all along, what i've said time and again to others, that it may very well be that that process, by the time we get through it,, closes the window on mounting a real estatistic campaign for president. that it might close. i've concluded it has closed. >> reporter: but biden said he won't sit on not be a candidate, i will not be silent. >> reporter: clintnt callll biden after his speech and tweeted, the vice president is a good friend and great man. today and always inspired by his optimism and commitment to change the world for the better. the buzz emerged in august as hillary clinton's campaign was floundering, when the new york times reported beau biden, before his death, has encou