“If I could be any candidate right now, I would want to be her.”HOUSTON — It’s impossible, stupid, and likely embarrassing to predict who is going to win the Democratic presidential primary.But it’s already become clear who has shaped it: Elizabeth Warren.Warren, the 70-year-old Massachusetts senator, has put her agenda for structural change at the center of the 2020 campaign, helping turn the party’s center into its right and its radical left into a plausible alternative. She’s set the standard for how you run a presidential campaign and watched her rivals — including the men who typically...…“If I could be any candidate right now, I would want to be her.”HOUSTON — It’s impossible, stupid, and likely embarrassing to predict who is going to win the Democratic presidential primary.But it’s already become clear who has shaped it: Elizabeth Warren.Warren, the 70-year-old Massachusetts senator, has put her agenda for structural change at the center of the 2020 campaign, helping turn the party’s center into its right and its radical left into a plausible alternative. She’s set the standard for how you run a presidential campaign and watched her rivals — including the men who typically...WW…