(a)
 In general 
Except as provided under subsection (b), no part of the Capitol Visitor Center may be designated or named without the approval of—
(1)
not less than 3/4 of all members on the Capitol Preservation Commission who are members of the Democratic party; and
 
(2)
not less than 3/4 of all members on the Capitol Preservation Commission who are members of the Republican party.