What a loaded poll question. First of all it asks about the effect of “a” homosexual rather than multiple homosexuals. Then it asks about a generic effectiveness.
How about asking:
If Don’t Ask, Don’t tell is repealed and your commanding officer is an open/active homosexual, will it affect your ability to serve in the military and obtain fair promotions if you refuse to engage in homosexual activities?
or
If Don’t Ask, Don’t tell is repealed and your unit has a dozen or so open/active homosexuals, will that affect the close interaction that is required for ALL members of a unit (such as a submarine)?
or
If Don’t Ask, Don’t tell is repealed, will you willingly join/transfer to/recruit to a group with more homosexuals than another?
or
If Don’t Ask, Don’t tell is repealed, do you believe that greater emphasis will be placed on social issues or military ability?
How about
“If you are willing to shower and bunk with a member of the same sex who is homosexual, are you (A)FOR or (B) AGAINST showering and bunking with members of the opposite sex, who may or may not be homosexual”