Rebecca Greenfield spoke to linguist Mark Liberman about why the verbal gaffe is so common:
The syntactic category rule means that when two words are confused for one another the "target" (the word replaced) and the substituting word are almost always of the same syntactic category. In normal speak: nouns replace nouns, verbs replace verbs, and so on. If "Obama" were a verb instead of a noun (as in, the Democrats are going to Obama the GOP in 2012), we would be substantially less likely to confuse it with the noun "Osama."
The speaker is also subject to what linguists call "priming." Your brain makes certain words more accessible to your tongue when they resemble–in pronunciation, in meaning, in subject matter–words that you frequently hear. "Priming means that when you've been reading/hearing/thinking about hospitals, words like 'doctor' and 'nurse' will be recognized more quickly, and are also more likely to be substituted in a slip of the tongue," Liberman explains. So hearing Osama and Obama in the same context makes your brain more apt to use them interchangeably in speech.
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The Dish 