MEXICO CITY
Mr. Madrazo, in third place in opinion polls, ended his speech after only two minutes and abandoned the rodeo ring where the rally was taking place in the central city of Pachuca, witnesses said.
He walked off after students whistled and shouted slogans in favor of Andrιs Manuel Lσpez Obrador, the left-wing front-runner, and booed Mr. Madrazo, from the Institutional Revolutionary Party, or PRI.
Mr. Madrazo is linked to the old guard of the PRI, which ruled Mexico for 71 years and earned a reputation for corruption and authoritarianism. "Long live the Peje!" students shouted, using Mr. Lσpez Obrador's nickname, after the pejelagarto fish typical of his home state of Tabasco.
Mr. Lσpez Obrador heads opinion polls for the July 2 elections by up to 10 points. Felipe Calderσn, of the governing conservative National Action Party, is in second place in the polls.
