That's not a bad request for protestors! Lawns can be damaged by an abundance of traffic and no one should have a right to destroy one's property.
Protesting on the sidewalks only and staying off people's lawns demonstrates manners, but maybe not!
I do not believe that protests are appropriate in front of homes- Office and government buildings yes and public squares yes- but not in front of peoples homes.
I remember when the Tea Party and other White Supremacy groups used to do that, and it didn't seem appropriate to me then either.
The family members and neighbors of politicians should not have to deal with protestors in front of their homes- even if the politician in the family or neighborhood is a real DICK!
I also believe that all public protests should have to require a permit from the police department to protest, and that all protests should be granted automatically, with the exception of protests in front of people's homes. But that gives the police departments fair warning to patrol protests as a precaution to keep them safe and orderly.
And remember- The White House is somebody's home too!
Also, if the property is zoned commercial property- even though people take up residency there- it should be fair game to protest in front of!
But that is just my opinion.