WASHINGTON -- Vote for me 'cause mine's bigger. Donald Trump yesterday fired the opening salvo in a macho battle of bank accounts with rival presidential contender Mitt Romney, dismissing the former Massachusetts governor as a "small business" person and saying his own assets are "much, much" larger than his opponent's. Trump, whose approval ratings have rocketed upward since he started hammering President Obama, yesterday turned his fire on Romney, considered by many the front-runner in a divided Republican field. "I'm a much bigger businessman and have a much, much bigger net worth. I mean my net worth is many, many,...