See a higher-res version of the image HERE.
Issues are your "accounts"; they're the different subjects in the political dialogue relevant to your personal interests. These are ordered according to which issue is "hot" at the moment. Each issue is colored-coded; this color coding remains consistent throughout every section of the page. For example, "Personal Privacy" is pale yellow. This allows you to see at a glance the several other items relevant to Personal Privacy today: a call to action, a progress update, an upcoming event, and two "players" to learn about.
Issue Tracker is like a stock ticker for your issues: it tracks any progress, updates or changes to the matters you care about. Content here can range from news articles, to live video coverage, to alerts on upcoming congressional votes.
Take Action offers suggestions for you to get involved. It lets you know about upcoming rallies or fundraisers, alerts when to contact your Congressman, or can even present you with survey questions (sponsored content in this section could also be a potential monetization channel).
Players are all the people involved with each of the stories you care about, presented at a glance. Clicking on an image would bring you to a "profile page," providing more in depth information about that person. For example, a politician's profile page might track something like their political rhetoric vs. their voting record.