Dickerson cited fewer than expected campaign donations and called on voters to support fellow Democrat Baron Hill.
Congressman Todd Young is the third Republican to enter the race for Sen. Dan Coats' seat.
Senator Joe Donnelly has put his support behind a bill aimed at streamlining the permit process for energy and transportation projects.
Norquist, Founder of Americans For Tax Reform, praises Mourdock for signing a document known as the “Taxpayer Protection Pledge”
The bill would end six-day mail delivery, close post offices and begin to phase out door-to-door delivery entirely.
One candidate has withdrawn leaving seven on the primary ballot.