Here's a paper by the Roper Center on political scandals (comparing Watergate to the Monica Lewinsky scandal): https://ropercenter.cornell.edu/public-perspective/ppscan/93/93025.pdf

In it they show polling from early 1974, about 6 months before Nixon resigned, and it is broken down to show responses from Republicans, Democrats and Independents. At the time, 57% of Republicans responded that Nixon should "stay on as President," while 32% say he should be "tried by Congress," and 11% saying he should "resign" already.

By contrast, the paper shows that in August of 1974, Gallup found that only 31% of Republicans believed that Nixon should be "impeached and compelled to leave the Presidency," while 59% of Republican did not feel that way.

Hi, the Nixon impeachment has been a hot topic in this subreddit during the last couple of months; you may be interested in a few recent posts

• US Presidents and the Dept. of Justice MEGATHREAD

• Did Richard Nixon have apologists in the press throughout the Watergate scandal? If so, did those journalist lose credibility after Nixon resigned?

• At what point during/after the investigation into Watergate did Nixon voters start to see the truth?