In the latest in a series of deals in the online-marketing space over the past two days, Theorem has acquired Webpencil, an interactive ad design firm, for an undisclosed sum. N.J.-based Theorem offers campaign management and analytics services for search, display and email ads, and the addition of Webpencil gives the firm a creative arm with rich-media experience.

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Las Vegas-based Webpencil’s client roster has included the Obama campaign and CareerBuilder, and founders David and Cheryl Rosowsky will remain with the company in their current roles. The other recent activity in online marketing includes new funding for Goodmail, Yodle, Go Internet Media and avVenta. Release.