A political activist from Fresno peddled one of the most popular pins at last weekend's state Republican convention in Santa Clara. "Nixon in 88," said the pins Mary Stanley was selling. She said she had sold more than 600 of them at other political events around the nation this year. The pins are popular with conservatives "who wish he was doing our negotiating with the Russians instead of the people we have now," said Stanley, who made news in 1984 when she resigned from the state Republican Central Committee to support Democrat Geraldine Ferraro for vice president. But many people buy the Nixon buttons for fun or because they cannot decide which of this year's crop of Republican presidential candidates to support. "It's a fun thing," she said. "With this button, they know they aren't going to get in trouble."