Rand Paul

The 52-year-old ophthalmologist has founded an eye clinic for low-income patients and once stood on the Senate floor for nearly 13 hours. Here's what else you might not know or remember.

From a place of significance to what message they want to convey, where and how presidential candidates announce their campaigns matters.

Days into his campaign, Paul is pouncing on the mainstream media and Democrats, though he insists his short temper is "pretty equal opportunity."

Ron Paul laid the groundwork for his son's political rise. But Rand is making it very clear — this is not his father's campaign.

As Paul embarks on a presidential campaign, he doesn't fit into the mold of either party neatly. Especially on foreign policy, the Kentucky senator faces a challenge.

Three weeks after the Democratic front-runner's news conference about her use of private emails as secretary of state, polls continue to show her ahead of GOP contenders.

Amid a measles outbreak, both Republicans said parents need a choice when it comes to some vaccines. The governor's office quickly clarified that when it comes to measles, "kids should be vaccinated."

Do billionaires have too much influence in both major parties? Three top Republican presidential prospects — Sens. Rand Paul, Marco Rubio and Ted Cruz — say no.

Contenders for the 2016 presidential race spoke at Saturday's Iowa Freedom Summit, and on Sunday night, Sens. Ted Cruz, Marco Rubio and Rand Paul will participate in a live-streamed discussion.