Walker polls high among hopefuls, though he has yet to officially declare.
People like to hear me speak,” Clinton said.
Fiorina launched her bid for the Republican presidential nomination with attacks on Hillary Clinton.
John Podesta said the campaign will not let attacks "go unchallenged."
Romney criticized remarks tying bias in the judicial system to economic inequality.
Hart says she got "called every name in the book” for backing Mitt Romney in 2012.
“It was something that I did completely unrelated to my job," the SEIU employee said.
“I think that she is the most likely person to be president," the billionaire investor said.
"Hope for Republicans there still is," Walker tweeted, channeling Yoda.
Amash praised his fellow libertarian as "the strongest defender of liberty" in the Senate.