As in a herbicide that is to be sprayed on a lawnful of politicians and
would leave upright only those with grass-roots? BRBR

Something like that. I think Dubya is the worst thing that has happened to the
US since Calvin Coolidge. Nixon disgraced the presidency, but he didn't damage
the country.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)