Guests at [PBS humorist] Mark Russell's annual St. Patrick's Day house party were charmed Sunday by 79 year old Lenora Tomalin, a feisty supporter of President Bush and his take no prisoners stance toward Iraq's Saddam Hussein.But they were shocked when Tomalin identified herself-to the likes of Tim Russert, Chris Matthews, Joe DiGenova and Victoria Toensing-as the mother of Susan Sarandon. That Susan Sarandon- who has been leading the charge of the Hollywood left against Bush and pending military action (and claiming it will simply further American imperial designs and appropriate Iraqi oil) and who shares 3 of Tomalin's 19...