The former chairwoman of a powerful Senate panel who served in Congress with President Joe Biden is now working on behalf of a corporate front group to block Democrats’ efforts to raise the corporate tax rate.

Blanche Lincoln, a two-term “Blue Dog” conservative Democrat from Arkansas, was swept out of office in the 2010 Tea Party wave after chairing the Senate Agriculture Committee, which oversees Wall Street financial derivatives. She has since launched her own lobbying firm, the Lincoln Policy Group, which has represented companies like Pfizer, Comcast, and Monsanto. Lincoln is serving as the public face of the RATE Coalition, which is leading the fight against Biden’s plan to raise the corporate tax rate.

Biden has proposed increasing the corporate rate from 21 percent to 28 percent, in order to fund his $2 trillion infrastructure investment plan. Republicans lowered the rate from 35 percent to 21 percent in 2017, as part of Donald Trump’s tax law.