WASHINGTON — They are two heavyweights of Democratic economic policy, each with deep ties to Harvard University, each a staunch supporter of President Obama. But the relationship between Senator Elizabeth Warren of Massachusetts and former White House economic adviser Larry Summers is more complicated than their resumes might suggest. While playing for the same team, they are not exactly allies. And now a new chapter in this occassionally strained relationship is being written. Warren has joined other Democratic senators in signing a letter in support of Janet Yellen, vice-chairman of the Federal Reserve, to be the next Fed chairman, a position that Summers also is seeking. Full story for BostonGlobe.com subscribers.
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