Associated Press/Mary AltafferPHILADELPHIA (AP) — Hillary Clinton is expanding her focus in the final days of the presidential race, seeking to help down-ballot congressional candidates. In Pittsburgh on Saturday, Clinton assailed incumbent Republican Sen. Pat Toomey, saying he had failed to "stand up" to Donald Trump in the face of his comments about Mexican immigrants and a Muslim-American military family. "If he doesn't have the courage to stand up to Donald Trump after all of this, then can you be sure that he will stand up for you when it counts?" Clinton said. Toomey is locked in a tight race with Democratic challenger Katie McGinty.