The election model weighs political and economic strength in each state.
"I think it's all fair game," Fiorina said of her criticism.
The jackpot sits at $1.5 billion.
Clinton's campaign chairman also issued a warning to Democratic rival Bernie Sanders.
The news outlet Fusion rounded up the first tweets of presidential candidates.
Rubio says Republicans are telling him "it's not your turn."
OPINION | The right and the left are meeting on Populist Street.
The doubts have nothing to do with policy.
Twitter is making it easier for campaigns to solicit donations.
The two Florida Republicans share many supporters and donors.
Ryan did not make the same pledge for other Republicans.
"I would say though that we just have a lot more talking to do ...," Kelley Paul says.
"Just this once, Trump's right," Clinton tweeted.
"Winning elections is about addition and multiplication," the chairman said.
"Don't you need to respond to it?" a CNN reporter asked Clinton.
Women are more likely than men to rate Clinton above Trump.
Bush is making the Palmetto State a key focus of his 2016 Oval Office bid.
Rubio says he doesn't discriminate, but an extremist of any religion would struggle.
The centrist group wants White House hopefuls to commit to weighty issues.
The Online Trust Alliance says most of the sites share user data.
The former Fla. governor gains the most if the 2012 GOP nominee passes on running again.
"Their days are numbered," Pelosi said of the GOP-controlled House.
"I think our party’s got a deep bench," the governor said.
Ryan's book The Way Forward: Renewing the American Idea goes on sale Tuesday.