ere. See 18 U.S.C. <span 
class="cmsy-10x-x-120">§§</span> 1503, 1505, 1512(b)(3), 1512(c)(2). Section 1512(c)(2) is
an omnibus obstruction-of-justice provision that covers a range of obstructive
acts directed at pending or contemplated official proceedings. No principle of
statutory construction justifies narrowing the provision to cover only conduct that
impairs the integrity or availability of evidence. Sections 1503 and 1505 also offer
broad protection against obstructive acts directed at pending 