[kabdib]

"I support this..." pages are okay. However, I prefer to call and write congresscritters and senators directly, saying either:

"Hi, I'm a constituent, and I believe senator/critter XYZZY should vote for/against the PLUGH legislation because..."

or

"Hi, I'm not a constituent, but I'll contribute to senator/critter XYZZY's next election (or his or her opponents) depending on the PLUGH issue."

A couple hundred dollars in the right place is probably worth more than a couple hundred signatures.