The reason for Frank's excursion is to try to win the support of the country's most powerful men, most of whom are in attendance. The key to unlocking victory seems to lie with winning their favor, from his old enemy Raymond Tusk, to Mark Usher, to General Brockhart. Frank tries a forceful approach, but Usher, whose allegiance to Conway is tenuous at best, suggests a more measured approach, which Frank is struggling with. There is also definitely a feeling that those with influence are scheming to have Conway marginalized. With Brockhart seeming like the more stable proposition, he is Tusk's chosen one to run the country, and Frank calls Stamper to alert him to that fact. Frank thinks the key to winning is to win over Tusk, and to undermine his relationship with the CEO of Pollyhop, the social media company that's in bed with Conway.