other, both republican presidential candidates threw jabs. >> i don't see how he's electable. jeb bush is a low energy person. for him to get things done is hard. he's very low energy. >> mr. trump doesn't have a proven conservative record. he was a democrat longer in the last decade than he was a republican. >> reporter: though bush set the date for his town hall first, his crowd of about 200 got walloped by trump's 1200. >> we have a lot of people outside, hundreds and hundreds of people standing outside. >> reporter: some even spilling into the over flow room to see the candidate in his first official town hall. >> you know what's happening to jeb's crowd as you know right down the street? they're sleeping! he was supposed to do well in new hampshire. he's gone down like a rock. >> reporter: though he dubbed himself the joyful tortoise, it seems wednesday night was the night bush came out of his shell throwing this punch at bush's immigration policy. >> hundreds of billions of dollars of costs to implement