Can slashdot form a PAC? I'm sure there are 15k people here that care enough about copyright to do something like that, and I'd certainly spend $10 a year to maybe get something accomplished..... rather than just endlessly troll.
Slashdot might be able to sponsor a PAC, or at least allow a PAC to use the Slashdot name. Or you could just start a PAC without any affiliation. The Federal Election Commission has good information regarding connected and nonconnected PACs, including registration toolkits. But, PACs are highly-regulated entities, so expect to spend a lot of time dealing with paperwork in order to stay legally compliant.
If you are serious about starting a PAC, you should try to find a lawyer who is willing to work pro bono to get things started. You can contact professors who teach copyright law. Some of them might be willing to help you or at least refer you to someone willing. At a certain point you'll probably need to use a portion of the PAC's income to hire some professional accounting or legal help. But, when you are just starting, you might find volunteer support is available if you take the time to seek it out.
Despite the other poster's comments, helping to fund political campaigns is not necessarily akin to "bribery." Campaign money cannot be used candidates for their own personal use. Yes, each candidate uses that money to try to get elected. But spending that money improperly (e.g., taking the family on a vacation or paying the mortgage) can land a candidate in serious legal waters.
Political campaigns are expensive. Each Representative and Senator has a constituency in the hundreds of thousands or millions. Candidates face tremendous costs trying to reach out to such a large population. And candidates cannot do it alone. In supporting campaigns, some people volunteer their time (which is worth money) while others provide money (which can be used, among other things, to compensate others for their time). Campaign financing makes it possible for those who are not extravagantly wealthy to accumulate the funds needed to run a meaningful campaign. And PACs make it easier for a large number of people, each providing small donations, to speak with one voice on a issues that they care about.