According to Real Clear Politics, Democrats in Ohio are apparently squealing to the courts in the absence of any sort of electoral strategy, now that American Crossroads has entered the race:

American Crossroads’ new TV ad in Ohio that bolsters former GOP Rep. Rob Portman’s Senate candidacy and message on jobs appears to be in violation of FEC coordination regulations, but a recent precedent shows that the group could escape without a fine.
The 527 committee’s ad showcases three photographs that originated from Portman’s campaign Web site and jobs plan document, and FEC rules state that using such photos constitutes an in-kind contribution that exceeds the legal limits. […]
Democrats note that the FEC’s advisory opinion in the EMILY’s List situation with Sutton prove that American Crossroads did violate regulations, because the FEC ruled in 2006 that EMILY’s List did break the rule. However, American Crossroads argued that the FEC’s opinion at the time, which suggested no action be taken, represents their case accurately, because in this case, too, there was no coordination with the Portman campaign. (The FEC found four years ago that the EMILY’s List arm that produced a communication on Sutton’s behalf did not do so based on an entreaty from Sutton’s team.)