The Republican convention that began today, and its Democratic counterpart that begins in two weeks are underwritten by taxpayer financing. Each major party gets $13.5 million for its four-day nominating extravaganza. The public funding was supposed to fee the parties from their dependence on private sponsors for these events. But the parties have found ways to accept private donations as well. NPR's Peter Overby reports the conventions are now more elaborate and expensive than ever.