http://thehill.com/blogs/ballot-box/...-steam-in-iowa

"Sen. Bernie Sanders (I-Vt.) has more than doubled his support in Iowa, as the Democratic presidential hopeful gains ground on front-runner Hillary Clinton in the early-voting state, according to a new poll.

Sanders takes 33 percent support among likely Democratic caucus-goers in the state, according to a Quinnipiac University poll released Thursday. That's up from 15 percent in the poll in May.
Clinton's support in the poll has fallen from 60 percent in May to 52 percent, while Vice President Biden takes 7 percent, and former Maryland Gov. Martin O'Malley receives 3 percent in the newest poll.

Eighty-five percent of Democrats surveyed in the poll view Clinton favorably, compared to 66 percent for Sanders. Still, more than a quarter of respondents, 26 percent, say they haven't heard enough about Sanders.

It is the latest poll showing a surge by the Vermont senator, thought to be a long-shot candidate for the Democratic nomination. He came within 8 percentage points of Clinton in a WMUR/CNN poll in New Hampshire last week.

Sanders, a self-described democratic socialist, reportedly drew 10,000 supporters during a campaign stop in Wisconsin this week. He came within 8 percentage points of Clinton in a Badger State poll last month.

The latest Quinnipiac survey of 761 likely Iowa Democratic caucus-goers was conducted June 20-29 via landlines and cellphones with a margin of error of 3.6 points."