Narcissistic Personality Disorder:

Has a grandiose sense of self-importance (e.g., exaggerates achievements and talents, expects to be recognized as superior without commensurate achievements)

Is preoccupied with fantasies of unlimited success, power, brilliance, beauty, or ideal love

Believes that he or she is "special" and unique and can only be understood by, or should associate with, other special or high-status people (or institutions)

Requires excessive admiration

Has a very strong sense of entitlement, e.g., unreasonable expectations of especially favorable treatment or automatic compliance with his or her expectations

Is exploitative of others, e.g., takes advantage of others to achieve his or her own ends

Lacks empathy, e.g., is unwilling to recognize or identify with the feelings and needs of others

Is often envious of others or believes that others are envious of him or her

Regularly shows arrogant, haughty behaviors or attitudes

With that in mind, witness this tidbit:

The Heritage Foundation’s Rory Cooper tweeted that Obama had casually dropped his own name into Ronald Reagan’s official biography on www.whitehouse.gov, claiming credit for taking up the mantle of Reagan’s tax reform advocacy with his “Buffett Rule” gimmick. My first thought was, he must be joking. But he wasn’t — it turns out Obama has added bullet points bragging about his own accomplishments to the biographical sketches of every single U.S. president since Calvin Coolidge (except, for some reason, Gerald Ford).