Under Section 3, it sounds like anyone participating in insurrection, i.e. overthrow of a duly elected President, aiding in the Jan. 6 insurrection (whether a current member of Congress or future candidate) can hold government office (state, Congress/federal) unless 2/3 of a Congress changes the law. Under section 4 it sounds like pensions also need not be paid if participating in insurrection. All members of a Congress who have put a verbal stamp of approval on violence by the rioters/protesters and encouraging such fall under the categories in section 3&4.
Under Section 3, it sounds like anyone participating in insurrection, i.e. overthrow of a duly elected President, aiding in the Jan. 6 insurrection (whether a current member of Congress or future candidate) can hold government office (state, Congress/federal) unless 2/3 of a Congress changes the law.