The two potential 2016 rivals have split over Obama's Cuba policy.
Rep. Keith Ellison (D-Minn.) said Warren would make Clinton a "better candidate."
With his isolationist image, Paul has set himself up for a likely bruising 2016 battle.
Justin Sink 12/18/14 03:19 PM EST
"The Bush family, I love personally," the president said.
"If she runs, it will be different," Clinton spokesman Nick Merrill said.
Progressive Change Campaign Committee founder Adam Green met with a Clinton aide.
GOP pollster called the incoming class of senators the "strongest" he'd ever seen.
Paul broke from the GOP presidential field on the issue.
A strong majority said they were contacted by campaigns too many times and saw too many ads.
The campaign post-mortem is "an admonishment to Democrats," a pollster says.