It would take a constitutional amendment to prohibit that. For good reason the founders weren’t really concerned about convicted criminals being elected.
You’d think it would be unnecessary, not many convicted felons could get elected to anything. Edwards is certainly no threat to win that House seat and serious democrats aren’t wasting their time trying to help him, he’s not worth your concern either, you should help make sure that ***hole RINO State Senator Dan Claitor who IS a threat to win (with democrat help, there is no serious democrat in the race), does not.
Has a convicted felon ever been elected to Congress? Alcee Hastings is the closest thing that springs to mind, impeached federal judge who was acquitted in a court of law (bribery charge) prior to being impeached and removed from office. He could have been forbidden by the Senate from holding federal office, but unfortunately was not.
Officers that are impeached by the House and convicted by the Senate are disqualified from holding an office of honor, trust or profit under the United States, which means that they can’t serve as President, VP, Cabinet secretary, ambassador, federal judge, or certain other Article II or Article III officers, but it is no impediment to serving as a Representative or Senator. Similarly, an ambassador is subject to impeachment, but a member of Congress isn’t (members of Congress are subject only to expulsion, which would not disqualify them from future election).