monrovia liberia rule party whose candidate finish runner-up first round month presidential election say sunday would back legal challenge result accuse president ellen johnson sirleaf interfere vote extraordinary charge unity party johnson sirleaf one members throw question second round run-off schedule nov. candidate vice president joseph boakai front-runner george weah unity party say statement oct. 10 poll mean usher liberia first democratic transition power since 1944 characterise massive systematic irregularities fraud statement read reporters unity party chairman wilmont paye say johnson sirleaf act inappropriately meet privately elections magistrates vote greed resurface callous form sow seed discord yet intent disrupt fragile peace liberia party say statement unity party officials say support legal challenge liberty party third-place candidate charles brumskine petition elections commission re-run first round liberian party businessman benoni urey also say sunday back complaint mean take part run-off augustine ngafuan unity party national campaign chairman tell reuters hope court rule run-off decide next official elections commission say expect hear formal complaint monday commission find appeal supreme court johnson sirleaf residence celebrate 79th birthday spokesman jerolinmek piah tell reporters would comment accusations late want overshadow festivities international observers european union carter center national democratic institute say saw major problems vote unity party statement cement fall johnson sirleaf nobel peace prize laureate party leadership 12 years power saw country consolidate post-war peace also draw sharp criticism allege corruption underdevelopment boakai serve johnson sirleaf vice president since president inauguration 2006. however johnson sirleaf decline endorse distance last administration weah former soccer star europe first round 38.4 percent vote boakai 28.8 percent momentum head run-off thursday pick endorsement former warlord prince johnson percent vote first round morluba morlu senior official weah cdc party say challenge result opt stage trouble matter ... stop election ambassador weah add weah unicef goodwill ambassador liberia 's rule party back challenge presidential result