Democratic Senate candidate James Talarico’s allies on Tuesday launched an ad campaign targeting GOP rival Ken Paxton, seeking to frame his opponent as “the most corrupt politician in Texas” ahead of the general election.

Lone Star Rising PAC, a group of wealthy megadonors supportive of Talarico, launched a seven-figure ad buy on digital and streaming platforms, according to the Texas Tribune. The development comes as the race has become one of the tightest in the country, with Democrats increasingly viewing it as a top possible pickup opportunity. The latest polling released Monday handed Talarico an edge roughly two months before voters cast their ballots.