President, Kerry skipping chances to press differences on same-sex marriage, abortionAlmost from the moment same-sex couples started lining up to get married at city halls from San Francisco to New Paltz, N.Y., experts predicted "cultural values" would play a dominant role in the presidential race.In one of the surprises of the campaign, it has not turned out that way.As the debates demonstrated, President Bush and Sen. John Kerry have reserved their greatest passion, and bile, for such issues as the war in Iraq, jobs and health care. The candidates have, if anything, tried to gloss over questions about abortion and...