First Amendment rights don't extend to threats and trafficking stolen financial instruments
Fifth Amendment rights are clearly satisfied; the motion practice described above indicates he was charged and habeas corpus is not an issue.
Sixth Amendment rights are muddied by the aforementioned motion practice - I am positive that if he had wanted a trial by now, he'd have one. I think the point is that he'd get convicted of something, hence the delay.
Eighth Amendment - someone with a bunch of stolen credit cards available has resources, so evaluating 'excessive bail'
Woodward and Bernstein weren't instrumental to the Watergate case, they were simply public relations arms. The case was proceeding without them, and would have ended up in pretty much the same place if they'd been run over by a bus. Despite the mythology, the principals would have found some other reporter to feed data to. The independent prosecutor was the key to the case beyond February 1973, initially Cox and later Jaworski. It is important to remember that initially, the press reports of Watergate were not considered a large issue by the White House. The potential testimony of the burglars themselves was the primary issue initially, hence the hush money delivered until after the 1972 election.