If you look at the revision history for Grenell's page and use control + F to search the word "revert" it's littered with reversions spanning the entire year. This seems to indicate anyone can indeed change Wikipedia at will, including political pages, and rather than preventing these changes entirely only after the change goes live will moderators/editors change it back whenever they notice the issue. If they don't notice it fast enough you get Google pulling incorrect information and displaying it on the search page.