Few politicians stray from pledging absolute fidelity to strong U.S.-Israel relations. But former South Bay Rep. Tom Campbell has come under fire for accepting $1,300 in contributions during his 2000 Senate campaign from a former Florida professor. The professor, Sami Al-Arian, pleaded guilty in 2006 to conspiring to help a terrorist organization, the Palestinian Islamic Jihad. Al-Arian had not been charged with a crime when he made the donation. Campbell's rivals in the race to face Democratic Sen. Barbara Boxer in November - Assemblyman Chuck DeVore, R-Irvine, and former Hewlett-Packard CEO Carly Fiorina - hope to use his links with the professor to gain ground on Campbell, who has high name recognition and leads most polls. Campbell [has] stood behind his opinion that the United States should support Palestinians and Israel should they agree to share Jerusalem as a capital city.