  We present a search for associated Higgs boson production in the process
$p\bar{p} \to WH\to WWW^*\to l^\pm\nu l'^\pm\nu'+X$ in final states containing
two like-sign isolated electrons or muons ($e^\pm e^\pm$, $e^\pm \mu^\pm$, or
$\mu^\pm \mu^\pm$). The search is based on D0 Run II data samples corresponding
to integrated luminosities of 360--380 pb$^{-1}$. No excess is observed over
the predicted standard model background. We set 95% C.L. upper limits on
$\sigma(p\bar{p}\to WH)\times Br(H\to WW^*)$ between 3.2 and 2.8 pb for Higgs
masses from 115 to 175 GeV.
