Possibly, but not many tech people are at Eich's level. I know I'm never going to be CEO of any well-known company, for instance, and neither are most of the other people here. Of course, most conservatives these days seem to think that they're all millionaires who are temporarily down on their luck, even when they're living in a trailer, so they could very act the way you describe anyway.
Anyhow, there's a big difference between supporting a *candidate* and supporting a particular *law* (proposition). You can always argue that you liked the candidate and/or his/her stand on the issues. Even if it comes down to the H1B issue, you can argue that you believe the program is mismanaged, used to keep engineering salaries low, etc.
There really isn't any way to argue support for Proposition 8, except that you hate gay people and think they should have lesser rights. There is no other rational explanation for supporting that proposition. You simply cannot claim support for equal rights (a cornerstone of western society), and support a law which denies equal rights, so anyone who does deny equal rights for fellow citizens is nothing more than a bigot.