Actually, this is an unfair comparison, since it compares a fictional character with a real person. I assume you are referring to the cartoon character named Garfield, rather than the former president named Garfield. In either case, Barack Obama is certainly better known and more famous than a cartoon cat-- while popular Cartoons are well-known in the USA, not every country reads the same cartoons, while just about every country has heard about the American president (whoever he may be) at one time or other.
As for the former president named Garfield (James A. Garfield), he only served 200 days in office before being assassinated in 1881. Today, few people remember him at all. Thus, we may safely say that in either case, Barack Obama is more famous world-wide.
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Barack Obama. He is known by more people.
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lady gaga i thinkBarack Obama
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Elvis
Mickey mouse is more famous than Barack Obama because Micky mouse has been here on earth sence Novmber 18,1928. and no body knew about Barack Obama till he ran for president