point national lead over Democratic Sen. John Kerry on Monday, according to a Reuters/Zogby poll. Bush led Kerry 48-47 percent in the latest 3-day national tracking poll, well within the margin of error. Shares of drug maker Merck & Co. fell more than 8 percent after the Wall Street Journal reported the company tried to bury concerns over its drug Vioxx for years. Merck was off $2.58, or 8.2 percent, to $28.72. Vioxx was withdrawn from the market after safety concerns were raised. PeopleSoft shares rose $2.14, or 10.3 percent at $22.91, while Oracle rose 12 cents to $12.78. Both trade on Nasdaq. Caterpillar was up $1.11, or 1.38 percent to $81.65 on the NYSE, while United Technologies rose $1.40 or 1.5 percent, to $94.23.