How long was barack obama president of the united states
- Was barack obama president of the united states
- How long did barack obama serve as president of the united states
- How many years was barack obama president of the united states
- How many times was barack obama elected president of the united states
- How did barack obama became president of the united states
- How old was barack obama when he became president of the united states
- How old was barack obama when he was president of the united states