If you really want to get Feinstein's attention, an internet petition, even an incredibly well-written one like TFA, isn't likely to do much. You need to pick up the phone and interact with a human being in her office, making sure that person understands the importance of this issue to you, one of her constituents.

If her staffers start being effectively being DDoSed from doing their jobs by phone calls about NSA surveillance, she will hear about it.

Source: my cousin and his wife were both Senate staffers for a number of years.