but mr. clinton on the campaign trail in iowa refusing to take the bait. >> it hasn't been a very pretty picture for her or for bill because i'm the only one willing to talk about his problems. >> and are you worried that your past could hurt your wife's campaign? >> i don't have a response. if he wins the republican nomination, we'll have plenty of time to talk about it. >> you know, it really is a distinct possibility actually. just yesterday, "time" magazine put trump on their cover with the headline "how trump won." >> well, in the meantime, trump is also throwing punches at his closest competitor in the gop race. we're talking about ted cruz. he's again raising the question of whether the canadian born senator is eligible to hold the nation's highest office and now trump is finding an unexpected ally on capitol hill. abc's tomlamas is on the campaign trail in iowa. >> reporter: as senator ted cruz drove through iowa today, donald trump tweeted him a helpful message -- "ted, free legal ad

. >> reporter: and in a reversal, mrs. clinton is now saying she wants more debates, starting next week. >> we have to agree that we're going to debate in new hampshire both the governor and i have agreed and we're waiting for the senator to decide to join us. >> reporter: we asked bernie sanders about that. >> i've wanted more debates from day one. >> i know. >> gee a couple of months ago, it wasn't the clinton people that were interested. i wonder what has happened now that they want more debates. what do you think has changed? >> reporter: here's what changed. sanders is surging. his campaign head quarters are so busy trying to score an upset iowa caucus win, this volunteer had no time for us. >> how is it going. >> it's going well. i'm a little bit too busy right now to talk though, i'm sorry. >> and the 74-year-old candidate he's in overall good health. good humor, too. >> how healthy are you? >> thank god, you always want to knock on wood. >> it's a frenzy of activity in iowa, sanders with four campaign events. hilla

obama gets the credit he deserves. >> reporter: mrs. clinton took time to sign an excuse letter for this high school student. >> i will sign it. that is so cute. >> reporter: but even here, there are saenz of bernie sanders' rice. this woman, a hillary supporter says she may jump ship. your mind on monday night? it could happen? >> 51 to 49. >> reporter: and hillary clinton says she wants to have another democratic debate next week before the new hampshire primary. it's a sign she's really the sanders campaign says they are considering having another debate next week but that all along they've said they want more debates. jonathan karl, abc news, des moines. >> president obama has marked holocaust remembrance day by honoring four people who risked their lives to protect jews. mr. obama spoke last night at the israeli embassy, the first sitting president to speak there. during his speech, the president said that anti-semitism is on the rice and that an attack on any faith is an attack on all faiths. >> police in austria are investigating

gets the credit he deserves. >> reporter: mrs. clinton took time to sign an excuse letter for this high school student. >> i will sign it. that is so cute. >> reporter: but even here, therere is homrun signs of bernie sanders rise. this woman, a hillary supporter says she may jump ship. >> what'ss the chance you change your mind monday night? it could happen? be. >> 51 to 49. >> reporter: and hillary clinton says she wants to have another democratic debate next week beforehe new hampshire primary. it's a sign she's really concerd about bernie sanders' ririce. the sanders campaign says they are considering having another debate next week but thatll along they've said they want more debates. jonathan karl, abc news, des moines. >> presidedent obama has marked holocaust remembrance day by honoring four who risked their lives to protect jews. speak at the israel embassy. he says anti-semitism is on the rise. >> police in austria are investigating the death of a woman from colorado who has been working as an au pair in vienna. the body

. >> mr. trump has a great capacity to use bluster and bigotry. >> publicly and professionally, hillary clinton was the single worst secretary of state in the history of this country. >> reporter: hillary clinton and donald trump apparently can't stand each other. but when it comes to their dutiful daughters -- >> i have my daughter, ivanka, here. >> reporter: ivanka trump there in new hampshire. >> i am so incredibly proud of my father. >> reporter: just as chelsea clinton was a few weeks ago. >> my mom is running to be president, and she's going to be president. >> reporter: they have more in common than you think. ivanka and chelsea's parents used to be friends. so they've known each other for years. as chelsea told "e.t." >> ivanka and i talk about everything. i'm so grateful she's my friend. i think she's a great woman. >> reporter: two 30-something women now earning their own place in the world. >> the responsibility sort of has to fall on you all now. >> reporter: ivanka apprenticed on