After nearly two decades of one-party rule, three years of an accelerating currency crisis and too many months of mind-numbing fuel lines, Bolivia is lurching to the right. For the first time since Bolivia’s Movement Toward Socialism party, or MAS, rocketed to power in 2005 under the maverick former union leader Evo Morales, Sunday’s presidential runoff pits two conservative, business-friendly candidates against each other. MAS received so few votes in the Aug. 17 elections that it almost lost its legal status as Bolivians expressed a prevailing desire for change.