Democrats dreaming of a `buy blue' Christmas BY COLLEEN MCCAIN NELSON The Dallas Morning News DALLAS - (KRT) - Some Democrats are hoping to have a blue, blue, blue Christmas this year. Two left-leaning Web sites are urging like-minded consumers to "buy blue" and support companies that contributed to Democratic candidates this year. It's another example of the hard feelings that remain after a bare-knuckle presidential campaign. Some still suffering from the post-election blues are hoping to parlay partisan frustration into support for pro-Democrat corporations. "We want to use (John) Kerry supporters' feelings and emotions about the election and spur...