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The 110th Congress was during the presidency of George W. Bush.

During the 111th Congress, from the appointment of Al Franken until the death of Ted Kennedy, as well as during the term of his appointed successor Paul G. Kirk, the Democratic party held 58 seats in the Senate and caucused together with 2 more senators.

https://en.wikipedia.org/wiki/111th_United_States_Congress "gave the Senate Democratic caucus sixty votes, enough to defeat a filibuster in a party-line vote."

https://www.nytimes.com/2009/07/01/us/politics/01minnesota.h... "providing Democrats with something they had long hoped for: 60 votes, and thus at least the symbolic ability to overcome filibusters."