By CATHERINE MALLETTE His nickname is "Mr. President," and Saturday night Nick Jonas and his new band — Nick Jonas & The Administration, but of course — kicked off their inaugural tour at Dallas’ House of Blues. The band played to a sold-out crowd of screaming girls, most of them clearly fans of the three Jonas Brothers, those multiplatinum, multimillionaire pop stars who, for the last year and a half, have called Westlake home.