We've seen it a gazillion times, these people have 'tunnel vision' when writing some Bill and a misplaced verb or noun leaves the barn door open for all kinds of future mischief. And when it's too late they go, "oops that wasn't my intent".
Heck, I just went through a similar situation with a Bill in IL. My State Rep wrote a Bill with 'good intentions' in mind, it was 'hijacked' and changed 100%. She then had to work her patoot off to DEFEAT her own bill, which she was able to, thank God.
Which kind of good intentions did Istook have? What was he trying to do?