Former Vice President Joe Biden and Massachusetts Senator Elizabeth Warren are at the top of the two dozen active candidates.
Warren is more popular than Biden: 75 percent of Democratic primary voters have a favorable opinion of her, five times the percentage who are unfavorable.
O’Rourke, an El Paso, Texas native, returned to the city after this month’s mass shooting, and espoused a strong pro-gun control position.
Warren also is being considered by a few more Democratic primary voters than are currently considering Biden.
But when Democratic voters are asked to name their first choice, Biden and Warren are essentially tied, followed by Sanders and then Harris.
Warren has an eight-point lead over both Biden and Sanders when liberals are asked to name their first choice.
More than a quarter (27%) choose Warren, while one in five (19%) name Biden and Sanders. »