While I lean on the side of taking action, what I've realized in my dealings with Congressional staffers is that members and their offices are all over the place when it comes to getting phone calls. They get very upset when right wingers call and say mean things and it can cause them to buckle under the pressure, because the Limbaugh listeners who call might ever vote for them (hah). They get very upset when left wingers call and pressure them, because left wingers are supposed to be on their side, even if they aren't on their side on a particular issue. When they're getting lots of mean phone calls they appreciate some supportive ones, but if they get too many supportive ones they get annoyed too.
So, overall, I don't really know what the impact is.
