These things are such red herrings. My wife used to be a lobbyist, so there are a few things I've learned that never seem to make the news:
- Most corporate donations aren't about support, they're about hedging bets with candidates. Many corporations will make donations to both Democrat and Republican candidates at national and state levels.
- Most (if not all) politicians aren't single-issue people. There's more going on than SOPA, such as the economy, wars, etc.
- Most lobbying is ineffectual on behalf of the corporation.
Back in the late nineties, during the DOJ trial with Microsoft, a few news outlets made a big deal about the millions of dollars that Microsoft had made in campaign contributions to various candidates and politicians. The anti-MS crowd, Sun chief among them, made a huge deal out of it (as they did with anything they could latch onto from an anti-MS stance). On further review of campaign contributions, it was discovered that Microsoft's political contributions paled in comparison to those of Oracle, IBM, Sun, Intel, and several others with large government contracts. Shocker!
There is a lot made in the press about the undue influence of corporations within American politics. While there are certainly those that exploit that influence (the military industrial complex and the oil industry come to mind), for most corporations it is a loss leader. In spite of the media's presentation, most corporations participate just enough to not be considered antagonistic toward politicians. The interpretation of exuberance in support is rarely reality.