Michael J. Fox is making his return to the midterm elections.
After cutting some memorable campaign commercials for now-Sens. Ben CardinBen CardinMcConnell tees up House Puerto Rico bill GOP senators: Brexit vote a wake-up call Dems take over floor to protest Senate inaction on gun control MORE (D-Md.) and Claire McCaskillClaire McCaskillVA opposes bill aimed at helping vets in mustard gas experiments Blame game begins on Zika funding Overnight Tech: Obama heads back to Silicon Valley | FCC meeting preview | Yahoo bans terror content | Zuckerberg on sit-in live streams MORE (D-Mo.) four years ago, Fox is back in a new spot for Sen. Arlen Specter (D-Pa.).
"Arlen Specter is moving forward," Fox says. "He's won the battles to double funding for biomedical research, to find cures and to save lives.
"He's smart, tough and always moving forward."
Fox's 2006 midterm ads for Cardin and McCaskill drew plenty of attention, especially after Rush Limbaugh accused him of exaggerating the effects of his Parkinson's disease during the ads.
Specter faces Rep. Joe Sestak (D-Pa.) in the May 18 primary. If he wins there, polls show he would also face a tough match in November, with former Rep. Pat Toomey (R-Pa.) leading.