If the press release out of the Democratic National Committee is any indication of the knots into which the Democrats would be tied by a presidential campaign by Mayor Giuliani, it is sure going to be an lively couple of years. The DNC’s communications director, Karen Finney, a veteran of Hillary Clinton’s Senate campaign, greeted the news that Mr. Giuliani had formed a presidential exploratory committee with a press release that must be read to be believed. “Giuliani Was A Registered Democrat For Much Of His Life,” the release begins. Only in Washington could the Democratic National Committee issue a press release attacking a politician for having been a Democrat. If having once been a Democrat were a disqualifier in the Republican primaries, a nominating convention would never have been held for a certain former Democrat named Ronald Wilson Reagan.