There is an unspoken rule in editorial cartooning that a politician's children are off-limits. People don't get to choose their family members so obviously it's unfair to ridicule kids for their parent's behavior while in office or on the campaign trail- besides, they're children. There are plenty of adults in the political world who act childish, so there is no need for an editorial cartoonist to target actual children.I've kept to that rule, except when the children are adults themselves or choose to indulge in grown-up activities (as the Bush twins did during the George W Bush presidency). But when...