Last week, a member of Sen. Tammy Duckworth’s staff called Rep. Ted Lieu’s team with a question: Couldn't the congressman have given her a heads up before issuing an endorsement in her state’s open, hotly contested Democratic Senate primary?

Lieu’s staff was puzzled. The California congressman, who, like Duckworth, is one of the most prominent Asian Americans and Pacific Islanders (AAPI) lawmakers on Capitol Hill, hadn’t weighed in on the Senate race in Duckworth’s state of Illinois.

Sen. Tammy Duckworth, D-Ill., in Washington, D.C., on Jan. 14.

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That’s when Lieu's team learned that Democratic Rep. Raja Krishnamoorthi’s campaign for Senate had implied otherwise, according to a person with knowledge of the conversation.

In fact, for months, the Krishnamoorthi

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