I went to Ceasar's camp, was vilified, so killed everyone there, shot Benny in the face, took the chip, told Yes man I had it, he said to come back once I'd taken care of House. Used the code on the computer I obtained somewhere to open the antechamber, ran from the Mark I's in there, opened House's pod, shot him in the face, went back out, uploaded Yes man to the computer. Was told the president was coming to the dam and I should speak to some ranger about preventing him from getting assassinated, I figured I would do it after I went to the fort and activated the army of Mark I's there.
When I fast travelled back to Vegas I heard on the radio that the president was assassinated and was like "uh, what? oh well" Went back to Yes man, went to the dam, diverted power to the fort to release the upgraded Mark II army, killed a bunch of Legion, walked up to Lanius and used Speech[100] about 10 times to get him to retreat. General Oliver busts in (no idea who this prick is), pisses me off, and I tell Yes man to throw him from the dam. Then Yes man says some weird stuff about using House's programming to make him more assertive.