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A cosponsor is a member of Congress who has joined one or more members in his/her chamber (i.e., House or Senate) to sponsor a bill or amendment. The first member to "sign onto" a bill is considered the "sponsor," members subsequently signing on are "cosponsors." Any number of members may cosponsor a bill in the House or Senate.
The THOMAS cosponsors display shows the member's name and date that she or he signed onto the bill. Member names can be displayed in chronological order by date of cosponsorship or alphabetically.
Occasionally, a member may choose to withdraw cosponsorship. If that happens, the line with the member's name in the cosponsor display indicates cosponsorship "withdrawn" and the date of the withdrawal.