Argentina's Presidential Race Intensifies with Multiple Candidates Vying for Power.

Argentina's presidential election battle lines have hardened after economy minister Sergio Massa entered the race in a dramatic late twist to take on front runners including a conservative city mayor, ex-security czar and libertarian economist. The most notable late confirmation has been Economy Minister Sergio Massa, whose candidacy was announced somewhat unexpectedly Friday night. Competing to lead the main conservative opposition bloc - which tops overall polls - are moderate Buenos Aires city mayor Horacio Larreta and more hard-line ex-security minister Patricia Bullrich. With no candidate or party polling over 50%, the likelihood is the October election will lead to a run-off, with all still to play for.