They WILL pay attention to your votes and fundraising, ESPECIALLY IN THE PRIMARIES.
This is primary season. You do the math.
But as I said, pulling up in DC with a couple hundred or maybe as many of 1,000 protestors won't do CRAP for your pet issue and may actually hurt it.
There are other ways of getting their attention.
They didn't in 2000.
And they didn't (again) in 2004.
Why should I think they will pay attention this time?