Secret Service protection does not start until 120 days before the presidential general election.
http://www.secretservice.gov/candidateprotection.shtml
Hilary has Secret Service protection because she is, among a great many other things, the wife of a former president.
I imagine the governors that are running have state police security details. For the other candidates, event specific security is probably being kludged together as needed using various police and private security resources.
Donald, of course, will just rent whatever he thinks he needs, with the usual option to buy.
Thanks, did not know that. So, Bernie did not have the Seattle Longshoremen’s union toughs to protect him— because he does not have their support as yet.
Or even SEIU thugs. In the interegnum to Queen Hills this now all makes sense.