This would be Senator Sheldon Whitehouse a Democrat from Rhode Island. Not likely to have a viable Republican challenger so voters will probably need to primary him out. He isn't up until 2018. He was unopposed in his 2012 primary.
Voters are not going to dump Senator Whitehouse over this proposed amendment, and don’t “probably need” to do anything.
First, in general Senator Whitehouse is great, I’d say among my top 10 favorite Senators (I’m from California, so not a constituent, just a fan). Second, this EFF blog post has decontextualized and exaggerated the effects of this change to the point of absurdity. Third, a small proportion of the general public is worried at all about the CFAA.
Reading the stuff over lunch, I am a bit confused over the EFF's position.