havana ostracize government mistrust much public cuba dissidents hop receive clear message support u.s. president barack obama visit island next month obama plan meet dissidents march 21-22 visit first sit u.s. president since 1928. follow rapprochement december 2014 obama cuban president raul castro end five decades cold war-era animosity cuba communist government long consider dissidents tiny illegitimate minority fund u.s. interest anti-castro group hold champion democracy political opponents say public bless obama might improve stand cause human right cuba possible visit help raise hop cuban people important cuba short many things hope say elizardo sanchez leader cuban commission human right national reconciliation monitor arrest political opponents sanchez say cuba hold 90 political prisoners include convict hijackers spy 11 former prisoners parole cuba say political prisoners addition cuban officials briefly detain average 700 dissidents month commission say obama republican critics call visit capitulation cuban dissidents mostly supportive gesture solidarity word gesture contact peaceful opposition would well receive majority population say jose daniel ferrer leader patriotic union cuba say 3,000 members make large opposition group cuba cuban foreign ministry official josefina vidal say cuba hop obama would meet real cuban civil society term make distinction cubans anti-government activists cuban dissidents prefer previous u.s. policy isolate cuba say obama fail ladies white march sunday havana say obama unwelcome unless respond request denounce repression activists call amnesty political prisoners make strong statement repudiate human right violations consider advance human right say berta sole leader group practice see thing dissidents hope public recognition obama cuba visit