MADRID, Spain (AP) -- Tens of thousands of people, many dancing or banging drums, packed the streets of Madrid on Saturday to celebrate Spain's new law legalizing gay marriage. "This is infinitely gay. There are no words to express it," Ivan Sanchez, a 26-year-old pharmacist, said as the throng snaked its way through the capital. Flatbed trucks crowded with young men and women honked their horns as they made their way through the streets under a blazing summer sun in a procession led by Culture Minister Carmen Calvo and other members of the governing Socialist party, which sponsored the law....