WordStream has picked up $4 million in a first round of financing led by Sigma Partners; the investment also comes with a new president and CEO, Rob Adler. Adler previously served as co-founder and president of CCBN, an online financial services company Thompson Financial acquired in 2004; founder Larry Kim will now serve as VP, marketing and products. The Boston, Mass.-based search ad technology firm will use the funds to support the launch of its new campaign management suite, which includes support for both paid and organic search optimization.