We could couple it with a repeal of all campaign finance laws.
As politicians, if it was politically tenable, they would love to repeal every campaign finance law on the book because it makes their jobs that much harder. If you had any sign of public support for such a thing, they'd do it.
Campaign finance laws are there to protect the imcumbents. It doesn't matter if it's harder or not, as long as it's harder for the challenger than the incumbent, the politicians will always be for it. If you think they are for repeal, then they've succeeded in fooling you.