Caging is a voter suppression tactic in which a political party, campaign, or other entity sends mail marked “do not forward” or “return to sender” to

Twelve senators introduce bill to outlaw voter 'caging' | RAW STORY | Published: Monday November 5, 2007

In a press release late Monday afternoon, Sen. John Kerry (D-MA) announced that he had introduced legislation to ban the practice of "voter caging," a practice in which groups send mail to voters' addresses and then use "return to sender" envelopes to challenge the legitimacy of individual votes.

Wikipedia defines 'caging' as "a term of art in the direct mail industry, as well as a term applied to a technique of voter suppression. A caging list is a list or database of addresses, updated after a mailing program is completed, with notations on responses received from recipients, with corrections for addresses that mail has been returned undelivered from, or forwarded onward from."

In October 2004, the BBC reported on a list of "caging" targets that had been culled from an email allegedly sent by the Bush campaign. The email, which was errantly sent to GeorgeWBush.org instead of GeorgeWBush.com, contained "a list of 1,886 voter names and addresses in largely African-American and Democratic areas of Jacksonville."

“The practice of ‘caging’ is reprehensible and has absolutely no place in our democracy," Kerry said in the release. "Here in America, every citizen, regardless of race, gender, religion or sexual orientation has the right to cast his or her vote. These are the very foundations of our democracy and this bill will ensure that we protect fundamental freedoms for millions of voters across our country.” ...