There are dozens of Democrats who voted for the unconstitutional individual mandate in ObamaCare who lost their seats last cycle.
I think it's every citizen's right - even duty - to be questioning these things rather than leaving it to some "Constitutional expert".
I'd encourage the original poster to drop the loaded term "ObamaCare" and instead explain why he believes the health care bill is not allowed under the interstate commerce clause. In my opinion, it isn't a very difficult thing to argue.
Every American has the right to question whether or not a law is constitutional. However, without expertise in constitutional law and elections, it is speculative to make claims that senators were ousted because voters believed a law to be unconstitutional.