A man who pleaded guilty to breaching the Senate chamber during the US Capitol insurrection was sentenced Monday to eight months in prison in a closely watched case that could influence how hundreds of other rioters charged with the same felony are punished.A man who pleaded guilty to breaching the Senate chamber during the US Capitol insurrection was sentenced Monday to eight months in prison in a closely watched case that could influence how hundreds of other rioters charged with the same felony are punished.