I agree that by itself outlawing campaign contributions would help rich candidates. Nevertheless the evil of campaign contributions, IMHO, is far greater than any other “legal” campaign issue.
I would in addition to outlawing campaign contributions, provide each candidate free broadcast time. The Federal government “owns” the airwaves, and can require than say 2% of all airtime belongs to the government for its own use, as part of the broadcasting license to all broadcasters – who BTW do not pay for their license – neither at the outset nor ongoing fees. Then the gov’t could give its airtime to political candidates.