Go towards the marker in the central part of Paramount and interact with it, in order to log on to your inFamous Paper Trail profile. IF you have taken all of the steps correctly, on the web page (tracking the car, basing on its license plate) you will e allowed to start mission nine and it is connected with reaching the location, where the senator's car is parked. Press Up on the D-Pad to start the mission.
You can now head towards the North-Eastern part of the Market District. Make it over to the rooftop of one of the buildings around, which will start a cutscene of the senator's car exploding. Go to the explosion scene. If you are playing as the villain (bad karma), you need to murder the senator (the Square). If you are playing as a hero (good karma), you need to heal him (the Triangle). Regardless of what you did, you still need to collect two more items from the crime scene- the Origami Dove and the Poster. You now need to exit the game again and log on to your inFamous Paper Trail profile.