WASHINGTON, Sept 14 (Reuters) - The U.S. House of Representatives on Wednesday unexpectedly backed a measure to expand federal hate crime protection to gay people, a measure that House conservatives had blocked for years. The Senate has passed similar legislation, which also expanded protections for the disabled, several times in recent years but House conservatives had argued that these cases should be dealt with on a local or state level without additional federal intervention. This time the hate crime measure was attached to a bipartisan bill known as the Children's Safety Act aimed at tightening reporting requirements for child sex...