Richard Milhouse Obama
Law prof Jonathan Turley compares them to explore the imperial presidency, how presidents override the checks and balances on power. Look who comes out worse:

Four decades ago, Nixon was halted in his determined effort to create an imperial presidency with unilateral powers and privileges. But in 2013, Obama wields those very same powers openly and without serious opposition.

-Surveillance. Nixon's use of warrantless surveillance was cited as one of his greatest abuses and led to the creation of the special Foreign Intelligence Surveillance Court. Obama, however, has expanded warrantless surveillance programs to a degree that dwarfs anything Nixon imagined, including initiating a program that captured communications of virtually every U.S. citizen.

-War. Nixon's impeachment included the charge that he evaded Congress' sole authority to declare war by invading Cambodia. Obama went even further in the Libyan war, declaring that he alone defines what is a "war" for the purposes of triggering the constitutional provisions on declarations of Congress. That position effectively converts the entire provision in Article I, Section 8 of the Constitution ("Congress shall have power to ... declare War") into a discretionary power of the president.

-Kill lists. Nixon ordered a burglary to find evidence to use against Daniel Ellsberg, who leaked the Pentagon Papers, and was accused of a secret plot to have the White House "plumbers" "incapacitate" him in a physical attack. People were outraged. Yet Obama has asserted the right to kill any U.S. citizen without a charge, let alone conviction, based on his sole authority. Internal documents state that he has a right to kill a citizen even when he lacks "clear evidence (of) a specific attack" being planned.

-Reporters/whistle-blowers. Nixon was known for his attacks on whistleblowers, using the Espionage Act of 1917 to bring a rare criminal case against Ellsberg. He was vilified for this abuse of the law, but Obama has brought twice as many such prosecutions as all prior presidents combined. Nixon was accused of putting a few reporters under surveillance. The Obama administration has admitted to putting Associated Press reporters, as well as a Fox reporter, under surveillance.

-Obstruction of Congress. Nixon was cited for various efforts to obstruct or mislead congressional investigators. The Obama administration has repeatedly refused to give evidence sought by oversight committees in a variety of scandals. In one case, Congress voted to move forward with criminal contempt charges against Attorney General Eric Holder, which Holder's own Justice Department blocked. In another case, Director of National Intelligence James Clapper lied before Congress on the surveillance programs, and later said that he offered the least untruthful statement he could think of. The Obama administration, however, refuses to investigate Clapper for perjury, let alone fire him. Recently, the administration was accused of searching Senate computers in an investigation of the CIA and trying to intimidate congressional investigators.

These examples are simply those connected with the growing internal security state. Other characteristics of an imperial presidency are equally evident, particularly in the repeated circumvention of Congress in ordering unilateral changes to federal law or suspending federal laws.

While many hail Obama for not taking "no" for an answer from Congress in areas such as health care and immigration reform, they may rue the day another president uses the same powers to negate environmental or anti-discrimination laws.