You're right it's an infantile joke. So you are willing to hang Brownback, with a lifetime ACU rating of 95%, because you believe he is wrong on this issue? If so, the joke is on you.
No, the joke is on your children and grandchilren who will be stuck with the effects of Brownbeck's lunatic vote.
Come on... Many Republican senators start out very conservative then become less so. Take a look at Senator McCain's ACU rating--- it's still pretty high because it used to be great. ACU ratings also don't always tell the whole story--- I remember Chuck Hagel getting a 100 score one year even though he'd spent it undermining the president from the left on conservative issues.
What if the vote was for reparations? Or for Sharia law to replace the Constitution?
A member of CONgress has the right to lose a constituent's support from just one bad vote on legislation.