Devin Henry 05/28/15 05:02 PM EDT
Candidates are faced with difficult calculus as they prepare their early state strategies.
Christie said the education standards have brought "confusion and frustration"
Trump will head to New Hampshire the next day.
Cain pointed to an article that argues Santorum will have less traction than in 2012.
Donors can win a signed photo of father and son.
The former Maryland governor is expected to launch a presidential campaign this week.
Jones, who sued Bill Clinton for sexual harassment, said Hillary should not be running.
The decision comes ahead of the South Carolina Republican's 60th birthday.
Richard Trumka said support of the TPP would cost Clinton the enthusiasm of organized labor.