Ed Garvey, the attorney who three years ago led football players to the first regular-season walkout in National Football League history, kicked off his U.S. Senate campaign today, vowing to tackle freshman incumbent Robert W. Kasten Jr. (R) on his right-wing record.

Kasten swept to victory in the 1980 Reagan landslide, but the president's popularity will not help him next year, said Garvey, the state's deputy attorney general. Garvey said Kasten has "five years of a record that show him to be very conservative, a Reaganite, on practically all the issues. On money, it will be difficult. On issues, I think we'll have fun with it."

Garvey anticipates spending between $1.5 million and $2 million, but said he expects Kasten to spend three times that.

Meanwhile in Los Angeles, supply-side economist Arthur B. Laffer declared himself a candidate for California's Republican nomination for the Senate.

Laffer, proponent of the Laffer Curve (which asserts that government revenues go up when taxes go down), blamed domestic spending and a Congress "gone wild" for record budget deficits. But during a tour through California this week, he targeted only one tiny program for elimination -- $245,000 in federal revenue sharing for the city of Beverly Hills. He promised more later.