BOSTON — Republican Mitt Romney, flush with cash from early fundraising, this week will air his first presidential campaign ad to introduce himself to voters in several early voting states. The 60-second spot describes the former Massachusetts governor as a "business legend" who "rescued the Olympics" and "turned around a Democratic state."Romney himself adds: "This is not a time for more talk and dithering in Washington. It's a time for action." The ad is set to air starting Wednesday in Iowa, New Hampshire, South Carolina, Michigan and Florida. It is the first ad by a top-tier contender in a campaign...