The Democratic presidential front-runner attended several fundraisers on Sunday.
Bush takes second and Kasich third in The Hill's latest rankings.
“I may lose,” Kudlow acknowledged. “It’s a long-shot. I’m not a politician."
Sen. Jeanne Shaheen reportedly plans on backing fellow Democrat Hillary Clinton.
“Donald Trump talks about things in ways that some Republicans really like,” she said.
The billionaire received a 61 percent favorability rating in Iowa.
“There’s a lot of partisan stuff going on that’s not fair" to Clinton, Klobuchar said.
“That is a legitimate issue for us to look at,” Scott Walker said.
Bush said Trump's immigration proposals would be too costly and impractical.
Biden is too much of an insider to challenge Sanders, according to New Gingrich.