Another famous attack on the Capitol was an actual bombing by | VDARE.com

Another famous attack on the Capitol was an actual bombing by the Weather Underground in 1971. The Weather Underground weren't very good bombers, although they did kill some people, and start some much worse riots, but they were pretty insurrectionary—they were trying to make the US lose a war with the Communists in Southeast Asia.
They also get mainstream Democratic support, as Michelle Malkin wrote recently

Meanwhile, actual convicted domestic terrorists like Black Liberation Army assassin Assata Shakur, Weather Underground killers Kathy Boudin and David Gilbert, and May 19th Communist Organizer Susan Rosenberg (a left-wing weapons supplier and insurrectionist pardoned by Bill Clinton and now a board member of the umbrella group overseeing Black Lives Matter) are deified by the media, Hollywood and academia.

BLM's Susan Rosenberg isn't the only Weather Underground terrorist enjoying mainstream Democratic support. Bill Ayers and wife Bernardine Dohrn were famously pals with Obama.

The son of terrorist murderess Kathy Boudin, above, is pro-criminal San Francisco DA Chesa Boudin.

These people are the Democratic Party.

https://vdare.com/articles/worse-than-the-civil-war-leftist-threats-to-american-democracy-and-the-capitol-are-supported-by-mainstream-dems