I’m hoping someone smarter than I reads this and can answer it:
It’s my understanding that the DREAM act provides a path to citizenship for the children of illegal aliens. If these children either complete a 4 year college degree (I assume a BA, BS, BSc, or equivalent), or serve two years in the US armed forces, they become citizens.
The act doesn’t spend any money to encourage the behavior, it doesn’t provide free education or health care or anything else.
Why would anyone be against that?
(Link to the Wikipedia entry with more details here. Still don’t see anything wrong with this)