new delhi indian prime minister narendra modi rule group sweep election home state gujarat survey show thursday shake serious challenge yet combine opposition election new state assembly gujarat see litmus test modi ahead national election 2019. vote close thursday win would help dismiss critics say rule bharatiya janata party support base erode last year shock move ban high-value currency note fight graft poor implementation national sales tax year hit businesses congress party lead rahul gandhi team regional politicians run tough campaign aim weaken modi home base rouse public discontent lack job soften economy three separate television exit poll close final round vote thursday show bjp win 100 seat 182-member state house well clear half-way mark 92 require rule congress main opposition party win 70-74 seat poll show good past enough oust bjp power another exit poll conduct today chanakya group give bjp two-thirds victory actual vote count monday exit poll survey often go wrong india millions vote congress party say quick call election base exit poll bjp rule gujarat since 1998 modi chief minister decade become prime minister three years ago modi praise transform coastal state economic powerhouse deploy business-friendly policies lure foreign investors ensure party prospect modi lead front campaign state address dozens public rally perform rituals even wave sea plane last day campaign trail thursday modi cast ballot gujarat ahmedabad city hit streets show ink finger walk surround hundreds supporters separate exit survey release state poll hold himachal pradesh state also show modi party emerge winner india pm modi 's party see sweep state poll popularity boost