Walker gets 18 percent compared to 16 percent for Bush.
Ahead of an expected April launch, she's bringing on a longtime Vilsack aide and two others.
The White House Counsel's office didn't know until Benghazi probe, a source told the AP.
The Democrat's rematch relaunch didn't go as planned though, with technical snafus.
Nearly every member of the delegation tells The Hill they're strongly looking at running.
Democratic congressman emails supporters he's in to succeed retiring Sen. Barbara Mikulski.
Bernie Becker 03/04/15 12:59 PM EST
He and Sen. Mike Lee (R-Utah) say their plan helps families and grows the economy.
The move is a shift from his refusal to discuss the matter before his 2014 reelection.
Bush reportedly hopes he will not be painted as a candidate beholden to the wealthy.
The AP reported that the email server was registered using her New York home address.