Someday robots will take control with an iron fist (or more likely, some sort of indestructible super alloy fist). But until then they will grab power the same way most evil overlords do...by exploiting loopholes in our American legal system.
For now, robot involvement in politics is benevolent and of a supportive nature. Or maybe that's just what they want us to think. Example:
If posters aren't your thing, try one of these buttons on for size.
It makes sense that robots would support Barack Obama. He's the candidate of the future. And McCain is all about the past. The robot-free past, if you catch my drift.