Lyndon Baines Johnson (August 27, 1908 – January 22, 1973), often referred to as LBJ, was an American politician who served as the 36th President of the United States from 1963 to 1969, assuming the office after serving as the 37th Vice President of the United States under President John F. Kennedy from 1961 to 1963. Johnson is one of only four people who have served in all four federal elected positions.
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What convinces is conviction. Believe in the argument you're advancing. If you don't you're as good as dead. The other person will sense that something isn't there and no chain of reasoning no matter how logical or elegant or brilliant will win your case for you.