While Senate rules are confusing to mere mortals, the basic point is that if one senator wants to, she or he can force the Senate to take a lot of time to do anything. They can't stop it without more support, but they can make it painful and time consuming.
And Kagro explains the consequences of the hold, including retribution.
If you're in the mood reward good behavior with cash.
Or, at least, consider signing a petition with your support.
