Get ready for some serious class warfare tonight.

(Politico 44) — Billionaire Warren Buffett’s longtime secretary will be joining first lady Michelle Obama in her box at tonight’s State of the Union, White House communications director Dan Pfeiffer announced on Twitter.

Debbie Bosanek, who has worked for Buffett for nearly two decades, has become a symbol in the White House’s fight over the tax code and economic fairness. Obama is expected to renew his push for the so-called “Buffett rule” that would bring investment taxation levels into line with income taxation levels — and ensure that upper income earners pay rates as high as middle-class Americans.

“Warren Buffett’s secretary shouldn’t pay a higher tax rate than Warren Buffett,” President Obama said in September, when he unveiled his American Jobs Act proposal. It’s a trope that Buffett himself has repeated, as he has campaigned for higher taxes on investment income.

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