Even a downpour couldn't stop the Gay Pride March down Fifth Avenue yesterday, which attracted half a million participants and an estimated million spectators. Besides the costumed performers, motorcyclists, bands and floats, elected officials were part of the parade. Along with Mayor Bloomberg and Senator Schumer, City Council Speaker Christine Quinn and Governor David Paterson marched and spoke out on behalf of gay rights. Paterson, who has been very supportive of gay rights, was welcomed......