What do I say?
Say what you wish to tell the Senator so it's pretty self explanatory. Some short examples:
"I'm calling to tell the Senator that I'd like him to vote for the DREAM Act." "I wanted to let the Senator know that I'd like him/her to support the DREAM Act." "I think that the DREAM Act is an important proposal and feel that the Senator should support it." "I'm calling to remind the Senator about my support for the DREAM Act and I hope that he will vote for it."
If you really wish to make your point you can go on for quite a while reminding them of some of DREAM's provisions and benefits. If you're leaving a message, especially at night, please try to make it detailed and explain why exactly you support it.
If you are calling a representative from your state MAKE SURE YOU LET THEM KNOW THIS.