They know that lots of people were opposed to a variety of issues in the bill and that voting against one of them was not a specific vote against any single project.

there are last minute or intentionally unacceptable additions to bills which are called 'riders', and it's a lamentably common practice to attach them to bills in order to sneak them through OR put them in there on purpose to make your opponent vote against the entire bill, so you can then claim that your opponent is 'against (the) child education (bill)' or whathaveyou - never mind that what he was really voting against was the rider stipulating mandatory sterilization of Muslims or whatever.

just another dirty political trick. they're slinging 'em for alllll they're worth these days.