The secretary of state will gladly pay the ticket, a spokesperson said.
He tweeted a fake phone call between two actors dinging his potential 2016 rivals.
The trips could open Clinton to attacks.
David Kochel, who headed Romney's past Iowa efforts, is in line to manage Bush's campaign.
The Vermont senator is considering a challenge to Clinton from the left.
He's launching the “Security through Strength" committee as he weighs a White House bid.
The “First in the Nation Republican Leadership Summit” will be held April 17-18.
In a radio interview, the Wisconsin governor shakes off criticism that he lacks charisma.
Clinton is reportedly considering rescheduling an announcement until the summer.
Indiana governor and potential GOP 2016 contender says the reports caught him by surprise.