Stock market today: Dow, S&P 500 score records amid Santa Claus rally hopes; AI stock jumps (live coverage)

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The S&P 500 climbed 0.3% to its second consecutive closing high. The Nasdaq composite tacked on 0.2%. The small-cap Russell 2000 index rose 0.3%. The stock market closed early at 1 p.m. ET and will …