Web based political campaign management-why no major players yet?

why aren't there major players for a dedicated web based political campaign management platform?

Not for dearth of capital/ monetization risks .. if it were proved benficial, then politicians would be pumping money into the same.

For the last few years, social networking has tailored to a particular niche..

Linkedin- Jobs/career Ning -private social networks academia.edu - Social networking for Researchers and so on.