Clinton beats back strong challenge from Sanders in Nevada caucuses

LAS VEGAS/COLUMBIA, S.C. (Reuters) - Democratic presidential candidate Hillary Clinton beat back a strong challenge from Bernie Sanders in the Nevada caucuses on Saturday, a result that could help calm worries among supporters about the strength of her campaign. Clinton's victory denied Sanders the breakthrough win he sought in a state with a heavy minority population, but his ability to close a one-time double-digit polling lead for Clinton suggested the Democratic nominating race would be long