Kentucky Attorney General Jack Conway joined an effort to urge Congress to extend tax relief to homeowners who have had mortgage debt canceled or forgiven because of a decline in housing values. Since 2007 mortgage debt that is forgiven after a foreclosure or short sale can be excluded from a taxpayer’s taxable income. But that exclusion will expire at the end of this year. Conway was one of 42 attorneys general to sign a letter that went to U.S. House and Senate leaders Tuesday urging them to extend the exclusion.