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The crowning irony of the stormy relations between Hamilton and Jefferson is that Hamilton helped install his longtime foe as President in 1801. Under constitutional rules then in force, the candidate with the majority of electoral votes became President; the runner-up became Vice President. That created an anomalous situation in which Jefferson, his party's presumed presidential nominee, tied with Aaron Burr, its presumed vice presidential nominee. It took 36 rounds of voting in the House to decide the election in Jefferson's favor. Faced with the prospect of Burr as President, a man he considered unscrupulous, Hamilton not only opted for Jefferson as the lesser of two evils but also was forced into his most measured assessment of the man. Hamilton said he had long suspected that as President, Jefferson would develop a keen taste for the federal power he had deplored in opposition. He recalled that a decade earlier, in Washington's Cabinet, Jefferson had seemed like a man who knew he was destined to inherit an estate--in this case, the presidency--and didn't wish to deplete it. In fact, Jefferson, the strict constructionist, freely exercised the most sweeping powers as President. Nothing in the Constitution, for instance, permitted the Louisiana Purchase. Hamilton noted that with rueful mirth.
Chernow is the author of The House of Morgan, Titan and the recent best-selling biography Alexander Hamilton