new york within minutes jeb bush drop presidential race saturday night donors prepare throw financial support behind marco rubio emerge strong candidate among establishment wing party jeb network already naturally migrate marco say gaylord hughey top bush fundraiser texas echo four top donors tell reuters clear path stampede add another donor speak condition anonymity want give bush time drop go public support rubio u.s. senator florida three bush donors decline name also say plan support rubio although fail win first three nominate contest rubio consider many political strategists best position challenge frontrunner donald trump billionaire political outsider senator ted cruz texas campaign anti-washington message likelihood bush deep-pocketed donors back rubio come opportune time candidacy head series contest march crucial build momentum brian ballard raise money bush last year switch allegiances last summer rubio say flood tonight ninety-five percent jeb money go end marco rubio million cash hand end january federal campaign finance report release saturday night show slim buff modern campaign standards conservative solutions political spend group support campaign 5.6 million hand end january spend additional 9.3 million advertise first 19 days february contrast right rise bush political spend group 24.5 million hand end january spend 6.6 million february ads network donors prove financial might help bush one point amass war chest 150 million even bush drop donors privately complain missteps campaign express concern strength trump candidacy bush lackluster debate performances january dozen top bush donors interview reuters say angry bush use money lob attack ads rubio damage candidate think best chance win also say privately signal rubio campaign would support bush drop go public time fear displease bush dynasty addition bush money rubio expect reap support billionaire industrialist koch brothers donor network expect spend 400 million presidential race accord several network donors koch political organization officials koch brothers also midst plan efforts undercut trump candidacy network officials members say recent private retreat california focus group research show voters learn trump past business behavior hurt ordinary people sour accord source speak condition anonymity report michelle conlin edit paul thomasch mary milliken article fund part sap independently create reuters editorial staff sap editorial involvement creation production wealthy donors draw rubio white house bid bush drop