Aside from Clinton, the former secretary of state, senator and first lady, potential Democratic contenders include Vice President Joe Biden, New York Gov. Andrew Cuomo and Maryland Gov. Martin O'Malley. Among Republicans in the mix: Bush, the former Florida governor; New Jersey Gov. Chris Christie; Cruz; Louisiana Gov. Bobby Jindal; Kentucky Sen. Paul; Texas Gov. Rick Perry; Florida Sen. Marco Rubio; Wisconsin Rep. Paul Ryan; former Pennsylvania Sen. Rick Santorum and Wisconsin Gov. Scott Walker.
A look at who's doing what:
NONDENIAL DENIAL: Cagey words that cloak presidential ambitions, none too convincingly.
Biden: "If I decide to run, believe me, this would be the first guy I talk to. But that decision hasn't been made, for real. And there's plenty of time to make that." April, CBS, in joint interview with President Barack Obama.
Clinton: "I haven't made up my mind. I really have not." — December, ABC.
Cuomo: "I'm sorry, I'm losing you. We have a technical difficulty. I'm running for governor of the state of New York." — Seeming not to hear a question about his presidential intentions. February, Fox Business Network.
O'Malley: "No one ever goes down this road, I would hope, without giving it a lot of consideration and a lot of preparation and a lot of thought work, and so that's what I'm doing." — February, speaking to reporters in Baltimore.
Bush: "I can honestly tell you that I don't know what I'm going to do." — His standard disclaimer. Says he'll decide by end of year whether to run. One factor in his decision: Whether he can run an optimistic campaign and avoid the "mud fight" of politics.
Christie: "I am enormously flattered that folks would talk about me in my party as someone who they think could be a candidate for president. But I am absolutely in — nowhere near that consideration process." — Jan. 9 news conference addressing the scandal over Fort Lee, N.J., traffic tie-ups.