Ruling Party, at 70, Tries Hard to Cling To Power in Mexico
Analysts for years have been predicting demise of Mexico's Institutional Revolutionary Party (PRI), but its recent election victories have undermined those arguments; debate over party's past and future dominate Mexico as Pres Ernesto Zedillo and 2,000 party stalwarts prepare to celebrate its 70th anniversary on March 4; party for decades was tool of successive presidents using authoritarian methods to insure one-party rule; over last 20 years, opposition parties have chipped away at monopoly and currently control Congress and 10 of 32 state capitals; dozens of PRI leaders have defected to opposition; PRI has never lost presidency; polls suggest that party can win presidential election next year, but only if it can avoid damaging split; Zedillo says that unlike his predecessors he will not handpick his successor; photo (M)
