Seems like Romney has already given his response.
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His record in liberal MA could have been a lot better but:
"Romney was a leading voice against gay marriage as Massachusetts governor. The courts legalized gay marriage in the state during his tenure, but he supported a constitutional amendment to define marriage as the union of a man and a woman.
After gay marriage became legal, Romney sought to enforce a statute banning state officials from marrying gay couples from other states. In a speech to conservatives last winter, Romney touted that move, saying he prevented Massachusetts from becoming the "Las Vegas of gay marriage."
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Sure, he did a lot of bad things as well, but our choice is Romney or Obama. Which is it going to be?
The answer is obvious. However, expect Obama supporters, disguising themselves as conservatives, to try to discourage us from voting against Obama and making absurd claims such as there is no difference between Obama and Romney.