The questions:
Why was Watergate such a big deal? I’m no expert, but it seems like a relatively mild level of corruption compared to what I see generally?
Was Nixon a popular and successful president? His electoral results blow my mind sometimes, 520 electoral votes in 1972! Why did he fall from grace? Did he deserve it?
Watergate created a problem because of what it exposed about the atmosphere inside the Nixon inner circle. I believe that this was when the saying “It’s not the crime. It’s the cover-up” became established. Beyond the Watergate burglary itself, Nixon had a group dedicated to violating the civil rights of his enemies, including someone who broke into the office of Daniel Ellsberg’s psychiatrist. Back then, people cared about this sort of thing.
Nixon had to contend with a Democratic Party that continued a long period of dominance in Congress. His domestic policies were pretty far to the left (wage-price controls, big increase in Social Security payments, Environmental Protection Agency). He personally only cared about foreign policy, and although he was more hawkish than the Democrats on Vietnam, his policies with respect to Russia and China were well to the left of Republican orthodoxy. So if he was popular and successful, it was by appeasing the left.
In the end, that was not enough. The left still hated him, in part because of his history during the McCarthy period, in part because the left always hates prominent opponents (and, yes, the right also always hates its prominent opponents), and in part because Nixon had an unlikable personality.
Nixon also had to contend with a media environment in which the major news outlets had total control over the narrative. There were no outlets to give widespread voice to any counter-narrative.
Nixon fired his special prosecutor, Archibald Cox. Trump retained his special prosecutor.
Nixon’s scandals also had momentum. As new information came out, the surprises were that things were worse than previously thought. In contrast, Trump’s scandals have not produced momentum. They produced the opposite. Expectations were raised in the media, and when the scandals fell short of those expectations, scandal-mongering became a spent force.
The 1972 electoral-vote landslide? You could never do that now. California would not vote for a Republican for President today even if the Democrats put up Josef Mengele. But in the 1970s, voters were more flexible. They seemed to care about stuff other than just party label. In 1964 the landslide went the other way, toward the Democratic incumbent, Lyndon Johnson, because they perceived him as a candidate of peace and prosperity. The 1974 post-Watergate Congressional elections were a major landslide for the Democrats, because people were sick of scandals and unhappy with economic performance.
In 1972, Nixon’s opponent, George McGovern, did not have popular policy proposals. Most Americans wanted “peace with honor” in Vietnam, not a humiliating withdrawal. It was the post-Watergate Congress that prohibited any spending on Vietnam, making it impossible to deter North Vietnam from violating the agreement. Another policy of McGovern’s that Americans rejected was a $1000 income floor for every citizen–a universal basic income.
By 1976, Warren Zevon was singing
Everybody’s desperately trying to make ends meet
Work all day, still can’t pay, the price of gasoline and meat
Alas, their lives are incomplete
The price of gasoline was driven up by the actions of the international oil cartel. The price of meat was driven up in part by the “Russian wheat deal,” in which the U.S. sold grain to the Soviet Union, which had suffered from bad harvests.
Between Watergate and high prices for gasoline and food, the Republican Party “brand” was in bad shape. So the country elected Jimmy Carter, whose idea for gasoline was to continue with oil price controls and to establish a Department of Energy. By 1980, the failure of these efforts was evident, and Carter was defeated by Ronald Reagan. By 1984, the price of oil had plummeted, the overall direction of the economy was positive, and we saw another landslide, re-electing Reagan.
But as I said, back then voters cared about such strange things as war and peace, the unemployment rate, the cost of gasoline, and maintaining the appearance of propriety. Today, your party is inherently good, and the other party is inherently evil, regardless.