Mr. Gibson then noted to Mr. Bush that the Republican Party platform opposed civil unions. I can't find opposition to civil unions in the Republican Party Platform. I do however find opposition to "forcing states to recognize other living arrangements as equivalent to marriage."
Here's the relevant sections from the Republican Party Platform:
States should not recognize gay marriage from other states
After more than two centuries of American jurisprudence, and millennia of human experience, a few judges and local authorities are presuming to change the most fundamental institution of civilization, the union of a man and a woman in marriage. Attempts to redefine marriage in a single state or city could have serious consequences throughout the country, and anything less than a Constitutional amendment, passed by the Congress and ratified by the states, is vulnerable to being overturned by activist judges. On a matter of such importance, the voice of the people must be heard. The Constitutional amendment process guarantees that the final decision will rest with the American people and their elected representatives. President Bush will also vigorously defend the Defense of Marriage Act, which was supported by both parties and passed by 85 votes in the Senate. This common sense law reaffirms the right of states not to recognize same-sex marriages licensed in other states.
Source: 2004 Republican Party Platform, p. 85
Constitutional Amendment banning same-sex marriage
We strongly support a Constitutional amendment that fully protects marriage, and we [oppose] forcing states to recognize other living arrangements as equivalent to marriage. The well-being of children is best accomplished [when] nurtured by their mother & father anchored by the bonds of marriage. We believe that legal recognition and the accompanying benefits afforded couples should be preserved for that unique and special union of one man and one woman which has historically been called marriage.
Source: 2004 Republican Party Platform, p. 85