A "bundler" is someone who solicits, collects, and delivers contributions from many other people to a candidate, PAC, or party committee — concentrating influence in their name even though no single check exceeds the legal limit. Federal law requires disclosure of bundlers who are registered lobbyists and whose bundling exceeds a threshold, but the bulk of bundler activity is not publicly reported.
Proponents of broader bundler disclosure argue that bundlers exercise outsized influence — they often get access, ambassadorships, or other rewards — and that voters have a right to know who is delivering large sums of money even when those sums come from many individual donors. They cite the long-established practice of "$100,000 bundler" rewards by major campaigns.
Critics argue that disclosing the identities of non-lobbyist bundlers could chill ordinary civic participation in fundraising — hosts of house parties and informal solicitors — and that existing disclosure of individual contributions already lets reporters and watchdogs reconstruct bundler networks. Some prefer tightening lobbyist-bundler rules over a broader sweep.