Republican presidential candidate Jeb Bush speaks to local residents during a dinner in Iowa last week.
Republican presidential candidate Jeb Bush speaks to local residents during a dinner in Iowa last week. CHARLIE NEIBERGALL AP
Republican presidential candidate Jeb Bush speaks to local residents during a dinner in Iowa last week. CHARLIE NEIBERGALL AP

Poll: Bush has big lead over Rubio

July 20, 2015 04:00 PM

UPDATED July 20, 2015 08:52 PM

More Videos

  • How Russian bots and trolls invade our lives — and elections

    How do bots and trolls work to infiltrate social media platforms and influence U.S. elections? We take a closer look at these insidious online pests to explain how they work.