“Donald Trump does not represent the Republican party,” Perry says.
The numbers could see Cruz in the top tier of Republican candidates.
“He’s politicizing America’s national security," Christie says.
Sanders also says rejecting same-sex marriage shouldn't cost groups their tax-exempt status.
The New Jersey governor says he's been repeatedly exonerated.
Sanders says he'll get more big-name backers as his campaign progresses.
The political attacks show which GOP candidates Democrats view as the biggest 2016 threats.
Staff separated journalists from the candidate during a July Fourth parade in New Hampshire.
“I don’t think he represents the Republican Party," Bush said.
Trump said he is the only 2016 hopeful speaking out on immigration and border security.