The Circus

The second episode follows Sen. Marco Rubio, Gov. Chris Christie, former Gov. Jeb Bush and Gov. John Kasich as they prepare for the all-important, first-in-the-nation primary in New Hampshire.

This episode follows the angst and drama leading up to the Iowa caucuses, with a showdown brewing between Democrats Bernie Sanders and Hillary Clinton and the GOP's first real test of outsider candidates versus the establishment.

The fourth episode goes inside the Iowa fallout and the momentum leading into New Hampshire's primary. Who¿s got it? Who doesn't? And how can the Clinton and Trump campaigns pick up the pace to beat back the surge of Sanders and Cruz?

From the electric jolt of New Hampshire to the hard truths coming up in South Carolina and Nevada. Trump tastes victory, Kasich picks up momentum - and Bush faces the prospect of an impending do-or-die reality.

As the campaigns head towards the final stretch leading to Nevada and South Carolina, there's growing anxiety among both frontrunners and stragglers about just how high the stakes are - and the significance of falling behind.

With the field narrowed down to The Big Five, the campaigns spread their game across the country and play to their strengths - with eyes squarely focused on the all-important upcoming prize: Super Tuesday.

With big wins for the frontrunners on Super Tuesday the rest of candidates are reckoning with the results. But the biggest story of all might be one both Democratic and Republican establishments can agree on: how do they stop Trump?

It's make or break time for Rubio, Kasich and Sanders. As the candidates pin their hopes on Florida and Ohio, can they gather enough momentum to force a brokered convention - or will their campaigns finally run out of steam?

While Rubio gets trumped in Florida, the rest of the candidates remain cautiously optimistic. But are high hopes what they need to pull off a win and secure the nomination - or are they just delusional?

Foreign policy comes to the fore as the political climate grows fiery in the wake of the attacks in Brussels. As Trump and Clinton prepare to square off, can either of them prove their presidential mettle in handling the heat?