It isn't just in FEDERAL elections that the Federal government is REQUIRED ("shall guarantee") to prevent fraud, including prevention of voting and influence by foreign actors, because without fair elections and thus elected representatives VOTED ON BY THE CITIZENS, there can be no "Republican Form of Government."
The United States shall guarantee to every State in this Union a Republican Form of Government, and shall protect each of them against Invasion; and on Application of the Legislature, or of the Executive (when the Legislature cannot be convened) against domestic Violence.
From Apple's on-disk MAC OS dictionary:
republic | rəˈpəblik |
noun
a state in which supreme power is held by the people and their elected representatives, and which has an elected or nominated president rather than a monarch.
It isn't just in FEDERAL elections that the Federal government is REQUIRED ("shall guarantee") to prevent fraud, including prevention of voting and influence by foreign actors, because without fair elections and thus elected representatives VOTED ON BY THE CITIZENS, there can be no "Republican Form of Government."
https://constitutioncenter.org/the-constitution/full-text
From Apple's on-disk MAC OS dictionary: