“I don’t know what she’s going to do, but I do know this: The Democrats want her to run,” Carville a friend of both Bill and Hillary Clinton said on ABC’s “This Week With George Stephanopoulos.” And I don’t just mean a lot of Democrats. I mean a whole lot of Democrats, like 90 percent across the country. We just don’t — we just want to win. We think she’s the best person…. And that’s across the board.”
He's not far off. In 2008, Hillary's coalition included women, traditionalist Democrats, minorities except for African-Americans, and working class whites. This time, she'd be the choice of African-Americans--many were conflicted in 2008.
She'd have some opposition from the same recalcitrant liberal wing which supported Gary Hart, Bill Bradley, and Paul Tsongas, but even some of them would likely support her.
Others mentioned include New York Governor Andrew Cuomo, but, against Hillary, he would trouble gaining a majority in his own delegation. Vice President Biden would have supporters, but he was not a major factor against Hillary in 2008 and probably would not best her with any of the party's constituent groups. Maryland Governor O'Malley might run, but only if Hillary doesn't.
In the general election, no one on the GOP side has anything like the same stature. She would carry minorities at about same level as Pres. Obama in 2012, and she'd probably do about 5% better among whites.
She's no shoo-in, of course. No one ever is. Her approval rating right now is sky-high, even among Republicans, but that is at least partly because, as Secretary of State, she's not seen as a partisan political figure. Take that away, and her support returns to human levels. Secondly, 2016 is four years away, an eternity in politics, and lots could change.
That said, right now, she's the Colossus that hangs over the approach to the next general election.