You're quoting a rather meaningless poll given the low sample size:
"The latest Field Poll was completed February 5-17, 2013 among 834 registered voters in California."Since we're quoting statistics, here are some from the CDC.
Gay, bisexual, and other men who have sex with men (MSM) represent approximately 2% of the United States population...
In 2010, gay and bisexual men accounted for 63% of estimated new HIV infections in the United States and 78% of infections among all newly infected men.
http://www.cdc.gov/hiv/risk/gender/msm/facts/
In 2012, there were almost 9,000 cases of syphilis, and 84 percent of them were among gay and bisexual men
http://www.webmd.com/sexual-conditions/news/20140509/syphili...
My friends (who are gay) tell me there is a growing complacency amongst their younger gay friends, that HIV is seen as a long-term chronic condition rather than a killer disease. The results can be seen above.
Why does the issue of marriage dominate media headlines but not a peep about health? How much funding has gone into the campaign to legalise gay marriage versus educating people on safer sex?