From The Collaborative International Dictionary of English v.0.48 :
cross-file \cross-file\ v. i. & t. to register as a candidate for more than one political party in the same election. [WordNet 1.5]From WordNet (r) 3.0 (2006) :
cross-file v 1: have one's name listed as a candidate for several parties [syn: cross-file, register]