Booth, who shot Lincoln was a Southern sympathizer. Guiteau was, I guess, a Republican. He had supported Garfield and thought he had earned an appointment to be an ambassador. McKinley's assassin was an anarchist--thought all governments were evil. Oswald had Communist leanings, but I do not think he belonged to the Communst party.
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The Whig party stood for liberalism, economic nationalism, agrarianism, and pro-federalism. Four of the US Presidents were of the Whig Party.
The four presidential assassins are: Leon Frank Czolgosz, John Wilkes Booth, Charles Julius Guiteau, and Lee Harvey Oswald yeah, they all have 3 names
No US presidents were named Nathaniel.
If you're asking whether any US Presidents were constitutionally ineligible to hold office, the answer is no.
US Supreme Court justices do not advertise their party affiliation because they're not supposed to consider partisan ideology when making decisions. Unfortunately, in the real world, ideology plays a major role in constitutional interpretation and decision-making. The current Court leans toward conservatism: five justices were appointed by Republican Presidents and often support the Republican agenda; four were appointed by Democratic Presidents and typically support a more liberal agenda. Sonia Sotomayor, one of President Barack Obama's Supreme Court appointees, has stated she's registered as an Independent.