This summary is not the rule. The rule text controls.
Judges and people running for judge have to be careful about the political activities they take part in. They can't do things that would make people question whether they can be fair and independent on the bench.
This means a judge shouldn't act in ways that make it look like they favor a political party, a donor, or a particular group over the law itself. Even during a campaign for judicial office, they need to hold back from behavior that a normal judge wouldn't do, like making promises about how they'll rule on future cases or taking sides on hot-button political issues in a way that suggests bias.
The point of this rule is to protect public trust in the courts. If judges acted like typical politicians, making deals, taking strong political stands, or campaigning aggressively, people might start doubting whether they'll get a fair hearing in front of that judge. This rule keeps judges focused on being neutral and trustworthy, even when they're running for office.