When did obama serve as president of the united states
- When did barack obama serve as president of the united states
- What years did obama serve as president of the united states
- When did obama became president of the united states
- How many terms did obama serve as president of the united states
- How many years did obama serve as president of the united states
- What years did barack obama serve as president of the united states
- How long did barack obama serve as president of the united states
- When did barack obama became president of the united states
- How many terms did barack obama serve as president of the united states
- How many years did barack obama serve as president of the united states
- Did barack obama serve two terms as president of the united states
- During which years did barack obama serve as president of the united states