Marin Software, a provider of web-based software to manage search marketing campaigns, has raised a $7.25 million second round led by Benchmark Capital. The company’s first round has not been announced. The SF-based start-up offers a browser-based tool called Marin Search Marketer that lets advertisers manage all angles of a paid search campaign. In the same category, NYC-based Clickable has raised $6 million for its web-based tool to track search marketing spend. Release.