Also, dude - Indiana was blue last election. Not that I expect that to happen again, but there are a lot of Dems here.
The point is, to "change" the content or whatever on these sites, it would require a whole lot more of the hackers involved to actually penetrate the site's security. (Though I guess that's what happened with the CBS thing, I don't know.) A DDoS attack really only requires some participants, making it a pretty simple and easily perpetrated form of cyber sabotage. And it can be effective - as someone who uses LiveJournal, I can tell you that I'm used to having my ability to use it be hampered by DDoS attacks (which are even suspected of being linked to the Russian government, given LJ's widespread use in Russia). It can take a while for a site to recover from such an attack.
But I can't tell you why Anonymous in particular thinks it's a good response to this situation. It's just pretty easy for me to see -why- Internet saboteurs use it as a tactic.
Then again, my middle school social studies teacher wanted our school mascot to be the jackasses. We had to settle for jaguars.
It includes non-consensual oral sex acts, as well.