miami democratic presidential candidate hillary clinton whose buoyant position opinion poll threaten surprise new twist saga email saturday harness celebrity star power hop help win battleground state florida nov. 8. musician actor jennifer lopez headline free concert miami part star-studded effort get vote energize volunteer crossroads take right road future lopez shout scream fan rain gear dance rain shower red white blue confetti concert provide visual counter-programming late email snafu roil clinton race win white house federal bureau investigation say friday investigate email part probe clinton use private email system late-breaking surprise likely continue get extensive media play lead election day clinton campaign say take news stride saturday lash fbi director jam comey review jlo event first three high-profile concert state clinton want keep republican rival donald trump give former secretary state chance connect key demographic millennials sometimes struggle reach turn win clinton tell crowd celebrity-driven events like concert serve bite distraction controversy say eric kasper political scientist university wisconsin-eau claire way kind take edge things tend positive kasper say next week clinton take stage jay cleveland katy perry philadelphia nov. 5. harvard university poll week show among likely voters age 18 29 clinton lead trump celebrity right star reality television show apprentice turnout concern exceptionally negative tone year race white house turn young americans reuters/ipsos poll show presidential candidates long seek create buzz help celebrity pal say tevi troy chronicle strategy book jefferson read ike watch obama tweet 200 years pop culture white house campaign reach people necessarily interest politics interest pop culture say troy presidential historian work george w. bush white house events like large version campaign yard sign way show groundswell support behind candidate way appeal fan musicians kasper say create kind psychological connection otherwise might politician endorse presidential candidate instance kasper say clinton add pop celebrity homestretch campaign