Sights on the first caucus state, showing up at picnics, parades and house parties as we approach the long holiday weekend. peter doocy is live in des moines. who got the biggest bounce in iowa after the debate, peter? >> reporter: elizabeth warren, julie, according to a new poll from a democratic firm that shows warren in first place with harris right behind her and joe biden, the national front runner and the front runner here in third place, but still ahead of bernie sanders and pete buttigieg. and with the exception of warren, all these contenders are all heading to iowa. they are all in p...