The South Carolina senator launched run in his home state.
He is looking for any edge that might help cut into Hillary Clinton’s huge lead.
He said his son, Rand Paul, must be "on the right track" since he’s facing so much criticism.
Rep. Mike Coffman is turning down a Senate run to seek reelection to the House.
David McCabe 06/01/15 02:32 PM EDT
Other queries after his campaign launch included “How old is Martin O'Malley?”
Niall Stanage 06/01/15 01:31 PM EDT
But they also acknowledge that it won’t be an easy task.
Clinton will rally supporters on June 13 at a park honoring Franklin Roosevelt.
Florida senator to keynote event named after Jeb Bush's grandfather.
Graham said he was "ready to be commander-in-chief on day one."
O'Malley is seeking to challenge Clinton from the left after endorsing her 2008 bid.