What are the motifs in Burr by Gore Vidal?

Truth being a matter of opinion is a recurring idea. The same concern can be held in a more recent historical event, even that which has happened in the same generation, year, month, week or even day. A man's perception is his reality, and Mr. Leggett believes Colonel Aaron to be a blackguard, dishonest and disreputable. Leggett also believes that Martin van Buren is Burr's son and is cast from the same mold as Aaron Burr and should never be president. Leggett's assistant editor, Mr. Davies, is actually sympathetic towards Aaron Burr and supports van Buren's candidacy for the office of president. The two men have reasons for their beliefs, but their motivation seems to be purely political; that is, they each wish that the man they back will be made the next president of the United States. Can both men be right? Can both men be wrong? In this case it is relatively easy to see that they both have good points to consider and the truth of the matter lies somewhere in-between the two extreme beliefs.