Two activists poured the powder over the protective case at the National Archives Museum last month to call attention to climate change, prosecutors said.
The Constitution was not damaged, according to the National Archives Museum, which said that the powder was found to be a combination of pigment and cornstarch.
No, the Republicans controlled Congress for most of that time, or it was divided:
https://en.wikipedia.org/wiki/List_of_United_States_House_of_Representatives_elections_(1856–present)
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