This depends STATE BY STATE (or town by town), so check out your own state's rules. As for everywhere, only poll workers are banned from this, and people holding up signs for candidates have to be a certain distance from the building.
So SO many things contributed to this statistic, but the core of them all may be that the moment the super-rich were not MADE to share the success of their companies’ profits with the workers…they didn’t.
Rutger Bregman is the Dutch historian who became a global sensation after an appearance at this year’s Davos summit, where he accused attending billionaires of ignoring taxation. Now he has created another viral moment in an extremely uncomfortable interview with Fox News’s Tucker Carlson.
Bregman so riled Carson with his accusations of hypocrisy, critiques of Fox’s conservative agenda, and attacks on Donald Trump that the TV host called him a “moron” and angrily told him: “Go fuck yourself.”
Source
Lot more people around the world are going to watch this now than if it actually aired. Speaking truth to power is the best viral content!