Eugene Robinson: The Democratic jockeying begins

Sen. Elizabeth Warren, D-Mass., speaks beside her husband Bruce Mann, left, outside their home, Monday, Dec. 31, 2018, in Cambridge, Mass., where she confirmed that she is launching an exploratory committee to run for president. Warren on Monday took the first major step toward launching a widely anticipated campaign for the presidency, hoping her reputation as a populist fighter can help her navigate a Democratic field that could include nearly two dozen candidates. (AP Photo/Bill Sikes) The field of candidates for the 2020 Democratic presidential nomination is starting to form, with Sen. Elizabeth Warren, D-Mass., announcing Monday that she has launched a campaign "exploratory committee" — the same step that former housing and urban development secretary Julian Castro took earlier in December. Spoiler alert: Exploratory committees always come to the same conclusion. They're both running.

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