Mike Coffman has been airing radio ads discussing how easy it is to register to vote, noting that you only need to provide the last four digits of a Social Security number, any Social Security number. There's a certain risk in broadcasting how easy registration fraud is to commit, especially for a Republican. You wouldn't necessarily want to run those ads on stations with lots of unregistered, left-leaning listeners. They might decide to exercise that ability in order to protect it.
Ken Gordon apparently has been running whimsical ads obliquely promoting campaign finance reform. It looks as though the choice will be between restricting free speech and protecting ballot integrity.