"Grassroots Action is the leader in building custom conservative action networks for organizations seeking to expand their impact through the Internet."
"Grassroots Action is a for-profit company."
Yeah, so they're pretty much admitting that they will sell your personal information to their clients. Yes, there are organisations that only give out free stuff in exchange for your information, like this one is, just so they can turn around and sell it to anybody that wants it. There are also those that give out free stuff just so that they get your feet in their door, so you'll look around and maybe see something you like and buy it. This one, however, is not the latter. Notice the box at the bottom, "Allow partner organizations to contact me via email." If you check that, maybe you won't get spam in your inbox, maybe. Even if you don't though, they'll still have your address and maybe your phone number, if you put one in that actually is yours. They are a for profit company that profits off of the sale of your personal information. Just giving you a heads-up.