found a former president hard on the campaign trail. reporter: democrats are looking for a little help from the comeback kid. and i personally believe both the president and the congress have done a better job than most people think they have done. reporter: we caught up with president clinton as he rallied embattled democrats in chicago. how bad do you fear it could be? i don t fear it at all. it depends how bad we want it. if we want it bad enough we ll get it. reporter: democrats are most endangered in the house where the latest abc news estimate shows 107 democratic seats in jeopardy with 64 either leaning republican or pure tossups. republicans only need 39 to win the house. perhaps no race is as close as the battle for the president s old senate seat in illinois. what an amazing signal it would send to take the barack obama seat and make it the mark kirk seat. i present to you your next united states senator, mark kirk. reporter: republican mark kirk has hit democ
endangered in the house, where the latest abc news estimate shows 107 democratic seats in jeopardy, with 64 of those either leaning republican or pure tossups. republicans need only 39 to win the house. in senate races the struggle for control is turning ugly. i ve been called a nazi. i ve been called a whore. i ve been called a liar. reporter: in kentucky a rand paul supporter stomped on the head of a liberal activist. i just wanted to get out here with a sign, but i got my head stepped on. reporter: and then there s nevada. up, id. reporter: anin a murkowski running as a write-in candidate accused miller of an ethics violation. what would your classmates at west point say about how well you ve lived up to your code of honor? reporter: abc news learned the president and mrs. obama will appear in an ad for alexi giannoulias starting today. that s the only ad so far this year in which both will appear and a sign of just how much the president wants to save his old senate
rawb ohio the real challenge. does not senate seat go republican, democrat or independent come november? i honestly that is one of the few pure tossups. i wouldn t guess on that one. meek will not be the senator it, either going to be rubio or crist. i think that will be very, very close. if there is a republican wave operating in early november, then i think rubio will be able to win that. but a lot will depend on whether the democratic vote for the democratic nominee, presumably meek actually holds. megyn: this is a fascinating race. the senate race in arizona, who thought we would be talking about whether john mccain would win reelection as the arizona senator. it looks like he s going to, but not without a serious challenge.