new york democrat hillary clinton plan pour half presidential campaign budget advertise first three months year seek fend increasingly tough challenge chief rival bernie sanders accord summary spend plan review reuters first-quarter advertise blitz would represent almost double proportion money campaign devote spend average 2015. report prepare team finance committee aim paint picture fiscally prudent campaign operation spend heavily digital tool organize last year ready ramp ad spend 2016 white house race move critical new phase significant early resources mobilize finance committee 2015 help us make smart early investments key areas enable us continue strategic allocations q1 2016 report read first quarter crucial period presidential nominate contest kick iowa caucus feb. follow new hampshire primary feb. series early vote march include super tuesday march 11 state hold nominate contest many contest march report note big state expensive media market 2015 campaign devote nearly 10 percent spend technology digital tool fifth budget list-building almost another quarter state organize accord year-end document list-building refer amass name potential voters campaign want woo clinton campaign decline comment spend report increase focus advertise spend come campaign expect shrink ratios spend areas especially appear relate infrastructure state organize example project go 23 percent 2015 18 percent first quarter year list-building expect go 21 percent 2015 14 percent first three months 2016. report come two weeks iowa contest clinton lock tighten race sanders fiery u.s. senator vermont draw big crowd early-voting state call crack wall street emphasis fiscal prudence part broad effort clinton campaign reassure supporters learn 2008 campaign plague missteps include failure match organizational digital prowess barack obama ultimately democratic nomination general election clinton campaign raise 112 million last year primary fight accord previously release statement jan. 1. include 37 million raise fourth quarter campaign nearly 38 million cash hand head year accord statement year-end report note budget categories percentage total spend include dollar amount categories line items document include dollar amount overall budget third quarter last year campaign spend 12 million direct market online ads media buy accord campaign finance file federal elections commission file fourth quarter presidential campaign due jan. 31 additional report emily flitter grant smith edit caren bohan leslie adler sap sponsor coverage independently produce staff reuters news agency exclusive clinton plan ad blitz primaries kick campaign document