During the 2010 midterms, Grijalva faced his toughest re-election campaign yet, against Republican Ruth McClung. It was reported that although Grijalva had decades of experience and McClung had none, and although there were twice as many Democrats in the district as there were Republicans, the two candidates were neck-and-neck in the polls. The main reason was Grijalva's call for a boycott of Arizona in response to the state's new immigration law, SB 1070. Grijalva won 50%-44% -- his closest margin of victory since being elected, and the first close election in what is now the 7th since 1978, when Udall was held to only 52 percent of the vote.