AARP Indiana opposes the legislation being considered by the Senate.
Messer is a potential challenger to Democratic Sen. Joe Donnelly.
Indiana U.S. Sen. Joe Donnelly faced a mostly favorable crowd of several hundred people at a Muncie town hall meeting Sunday.
Rep. Rokita declined to come to the group's town hall meeting after they tried many times to invite him.
Addiction and recovery legislation known as CARA authorizes $181 million for states to fund treatment and education programs.
Following the shooting in Orlando, the U.S. Senate rejected all of the proposed gun control measures.
The senators say newspapers in the state have been using the term since 1826.
The bill, which the president has threatened to veto, will soon head to Obama's desk.
The AARP and state officials are working to help empower senior citizens to identify financial predators.
Sen. Joe Donnelly says he is supportive of a bill in Congress to speed up the processing of illegal immigrants.