I should point out that the Establishment Clause only forbids the making of a state religion, nor religion's banishment from making political stands.
Also, more money was raised for the No On 8 campaign, both in and out of California.
I've been an informal student of the Constitution since well before Al Gore invented the Internets.
It's amazing what you'll find in the library, though I am glad people have taken the time to put some of these sources on the web. It makes debating the issue much easier to have a valid source to link to instead of attempting to attain enough credibility on a new forum for people to believe one's words at face value.
From Bouvier's Law Dictionary, the first comprehensive American legal definitional work which was begun in 1826. Definition number 4 for Establish reads thusly...
4. To found, recognize, confirm or admit; as, congress shall make no law respecting an establishment of religion.
I cannot post links as of yet, but Google for "bouvier's law dictionary"should bring up the site.
While the Establishment Clause does indeed strive to keep the US from laboring under an Established State religion, it also erects the Wall that Mr. Jefferson, a lawyer, coined in his letter to the legal laymen of the Danbury Baptist Assoc.
The same source lists for Religion...
Real piety in practice, consisting in the performance of all known duties to God and our fellow men.... 4. But religion can be useful to man only when it is pure. The constitution of the United States has, therefore, wisely provided that it should never be united with the state.
Perhaps that has cleared the issue up for you? Whether rabid Evangelicals or rational Enlightenment thinkers, our Founders knew perfectly well what occurs when the institutions of religion and government are permitted to intertwine. They shed blood and spent lives to separate from just such a Despot of Theonomy.
Also, please list the out-of-state resources for the No to Prop 8 campaign, if you would be so kind. It is my firmest belief that any such funding from out-of-state on a State Referendum should be strictly prohibited.