What's kind of cool about this issue is that it attracts support from citizens of all political stripes - whether you're a farmer who just wants to be able to fix his own damn tractor, or a hacker who wants to futz with proprietary hardware, the law is patently bogus.
Unfortunately, farmers and hackers have far less political influence than corporations. Hopefully by pursuing this through the courts and with adequate resources from the EFF some progress can be made that couldn't be in congress.
To be more accurate, I would say the number of farmers that want to work with code/electronics to fix tractors is a small subset of "farmers." Try cutting a farming subsidy and you'll quickly see how powerful farmers really are.
Ted Cruz was the only candidate who dared challenge Ethanol mandates -- while campaigning in Iowa. Most political pundits considered that suicide. He won Iowa despite that, but it does show that farmers actually have disproportional power in national politics. However, the "hack my tractor" crowd is not necessarily exercising that power. Perhaps in the 2020 election, this will become a marquee issue (as ethanol has been in elections past.)