Dozens of Democrats declined to register a position on articles of impeachment by one of their own members, Representative Al Green, that cited President Trump's immigration crackdown.
At an event in Washington, partisanship took a back seat as elected officials, religious leaders, parents and artists called for reining in artificial intelligence.
The landmark legislation, known as the Clarity Act, stalled in the Senate as Democrats raised concerns about President Trump's personal investments in crypto.
Zohran Mamdani, the New York City mayor and democratic socialist, was viewed more favorably than Representative Alexandria Ocasio-Cortez, a fellow high-profile member of the movement.
The Congressional Budget Office said its analysis had been limited by the fact that the Defense Department did not respond to requests for information on the costs of the conflict.